diff --git a/__tests__/unit/client/theme-default/support/utils.test.ts b/__tests__/unit/client/theme-default/support/utils.test.ts
deleted file mode 100644
index 880d4232c274..000000000000
--- a/__tests__/unit/client/theme-default/support/utils.test.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { ensureStartingSlash } from 'client/theme-default/support/utils'
-
-describe('client/theme-default/utils', () => {
-  describe('ensureStartingSlash', () => {
-    test('it adds slash to the beginning of the given path', () => {
-      expect(ensureStartingSlash('path')).toBe('/path')
-      expect(ensureStartingSlash('path/nested')).toBe('/path/nested')
-      expect(ensureStartingSlash('/path')).toBe('/path')
-      expect(ensureStartingSlash('/path/nested')).toBe('/path/nested')
-    })
-  })
-})
diff --git a/__tests__/unit/client/theme-default/support/sidebar.test.ts b/__tests__/unit/shared/shared.test.ts
similarity index 86%
rename from __tests__/unit/client/theme-default/support/sidebar.test.ts
rename to __tests__/unit/shared/shared.test.ts
index f33dcbd94401..cd7a4b64fcfb 100644
--- a/__tests__/unit/client/theme-default/support/sidebar.test.ts
+++ b/__tests__/unit/shared/shared.test.ts
@@ -1,4 +1,5 @@
-import { getSidebar, hasActiveLink } from 'client/theme-default/support/sidebar'
+import { getSidebar, ensureStartingSlash } from 'shared/shared'
+import { hasActiveLink } from 'client/theme-default/support/sidebar'
 
 describe('client/theme-default/support/sidebar', () => {
   describe('getSidebar', () => {
@@ -143,3 +144,14 @@ describe('client/theme-default/support/sidebar', () => {
     })
   })
 })
+
+describe('client/theme-default/utils', () => {
+  describe('ensureStartingSlash', () => {
+    test('it adds slash to the beginning of the given path', () => {
+      expect(ensureStartingSlash('path')).toBe('/path')
+      expect(ensureStartingSlash('path/nested')).toBe('/path/nested')
+      expect(ensureStartingSlash('/path')).toBe('/path')
+      expect(ensureStartingSlash('/path/nested')).toBe('/path/nested')
+    })
+  })
+})
diff --git a/__tests__/unit/vitest.config.ts b/__tests__/unit/vitest.config.ts
index ff26e6791d6a..a11d869068fb 100644
--- a/__tests__/unit/vitest.config.ts
+++ b/__tests__/unit/vitest.config.ts
@@ -12,6 +12,7 @@ export default defineConfig({
       { find: '@siteData', replacement: resolve(dir, './shims.ts') },
       { find: 'client', replacement: resolve(dir, '../../src/client') },
       { find: 'node', replacement: resolve(dir, '../../src/node') },
+      { find: 'shared', replacement: resolve(dir, '../../src/shared') },
       {
         find: /^vitepress$/,
         replacement: resolve(dir, '../../src/client/index.js')
diff --git a/src/client/theme-default/composables/langs.ts b/src/client/theme-default/composables/langs.ts
index 4d105cd71787..1d2372570228 100644
--- a/src/client/theme-default/composables/langs.ts
+++ b/src/client/theme-default/composables/langs.ts
@@ -1,5 +1,5 @@
 import { computed } from 'vue'
-import { ensureStartingSlash } from '../support/utils'
+import { ensureStartingSlash } from '../../shared'
 import { useData } from './data'
 import { hashRef } from './hash'
 
diff --git a/src/client/theme-default/composables/prev-next.ts b/src/client/theme-default/composables/prev-next.ts
index 5bc39eca3909..cc8d03e775b4 100644
--- a/src/client/theme-default/composables/prev-next.ts
+++ b/src/client/theme-default/composables/prev-next.ts
@@ -1,7 +1,7 @@
 import { computed } from 'vue'
 import { useData } from './data'
-import { isActive } from '../../shared'
-import { getSidebar, getFlatSideBarLinks } from '../support/sidebar'
+import { isActive, getSidebar } from '../../shared'
+import { getFlatSideBarLinks } from '../support/sidebar'
 
 export function usePrevNext() {
   const { page, theme, frontmatter } = useData()
diff --git a/src/client/theme-default/composables/sidebar.ts b/src/client/theme-default/composables/sidebar.ts
index a5a07a16789e..9992dfac0477 100644
--- a/src/client/theme-default/composables/sidebar.ts
+++ b/src/client/theme-default/composables/sidebar.ts
@@ -11,10 +11,9 @@ import {
   type ComputedRef,
   type Ref
 } from 'vue'
-import { isActive } from '../../shared'
+import { isActive, getSidebar } from '../../shared'
 import {
   hasActiveLink as containsActiveLink,
-  getSidebar,
   getSidebarGroups
 } from '../support/sidebar'
 import { useData } from './data'
diff --git a/src/client/theme-default/support/sidebar.ts b/src/client/theme-default/support/sidebar.ts
index 74533362e1f9..257490c466aa 100644
--- a/src/client/theme-default/support/sidebar.ts
+++ b/src/client/theme-default/support/sidebar.ts
@@ -1,6 +1,4 @@
-import type { DefaultTheme } from 'vitepress/theme'
-import { ensureStartingSlash } from './utils'
-import { isActive } from '../../shared'
+import { isActive, type SidebarItem } from '../../shared'
 
 export interface SidebarLink {
   text: string
@@ -8,38 +6,6 @@ export interface SidebarLink {
   docFooterText?: string
 }
 
-type SidebarItem = DefaultTheme.SidebarItem
-
-/**
- * Get the `Sidebar` from sidebar option. This method will ensure to get correct
- * sidebar config from `MultiSideBarConfig` with various path combinations such
- * as matching `guide/` and `/guide/`. If no matching config was found, it will
- * return empty array.
- */
-export function getSidebar(
-  _sidebar: DefaultTheme.Sidebar | undefined,
-  path: string
-): SidebarItem[] {
-  if (Array.isArray(_sidebar)) return addBase(_sidebar)
-  if (_sidebar == null) return []
-
-  path = ensureStartingSlash(path)
-
-  const dir = Object.keys(_sidebar)
-    .sort((a, b) => {
-      return b.split('/').length - a.split('/').length
-    })
-    .find((dir) => {
-      // make sure the multi sidebar key starts with slash too
-      return path.startsWith(ensureStartingSlash(dir))
-    })
-
-  const sidebar = dir ? _sidebar[dir] : []
-  return Array.isArray(sidebar)
-    ? addBase(sidebar)
-    : addBase(sidebar.items, sidebar.base)
-}
-
 /**
  * Get or generate sidebar group from the given sidebar items.
  */
@@ -107,13 +73,3 @@ export function hasActiveLink(
       ? hasActiveLink(path, items.items)
       : false
 }
-
-function addBase(items: SidebarItem[], _base?: string): SidebarItem[] {
-  return [...items].map((_item) => {
-    const item = { ..._item }
-    const base = item.base || _base
-    if (base && item.link) item.link = base + item.link
-    if (item.items) item.items = addBase(item.items, base)
-    return item
-  })
-}
diff --git a/src/client/theme-default/support/utils.ts b/src/client/theme-default/support/utils.ts
index b04efa17cfc0..bd4779673601 100644
--- a/src/client/theme-default/support/utils.ts
+++ b/src/client/theme-default/support/utils.ts
@@ -16,10 +16,6 @@ export function throttleAndDebounce(fn: () => void, delay: number): () => void {
   }
 }
 
-export function ensureStartingSlash(path: string): string {
-  return /^\//.test(path) ? path : `/${path}`
-}
-
 export function normalizeLink(url: string): string {
   const { pathname, search, hash, protocol } = new URL(url, 'http://a.com')
 
diff --git a/src/node/plugins/localSearchPlugin.ts b/src/node/plugins/localSearchPlugin.ts
index e94eafb797f1..ae02e4658207 100644
--- a/src/node/plugins/localSearchPlugin.ts
+++ b/src/node/plugins/localSearchPlugin.ts
@@ -9,8 +9,10 @@ import { createMarkdownRenderer } from '../markdown/markdown'
 import {
   resolveSiteDataByRoute,
   slash,
+  getSidebar,
   type DefaultTheme,
-  type MarkdownEnv
+  type MarkdownEnv,
+  type SidebarItem
 } from '../shared'
 import { processIncludes } from '../utils/processIncludes'
 
@@ -122,12 +124,37 @@ export async function localSearchPlugin(
     return id
   }
 
+  function getParentTitles(sidebar: SidebarItem[], fileId: string) {
+    const titles: string[] = [],
+      path: string[] = []
+    const backtrack = (sidebar: SidebarItem[] | undefined) => {
+      if (!sidebar) return
+      for (let i = 0; i < sidebar?.length; i++) {
+        if (sidebar[i].link === fileId) {
+          titles.push(...path)
+          return
+        }
+        path.push(sidebar[i].text!)
+        backtrack(sidebar[i].items)
+        path.pop()
+      }
+    }
+    backtrack(sidebar)
+    return titles
+  }
+
   async function indexFile(page: string) {
     const file = path.join(siteConfig.srcDir, page)
     // get file metadata
     const fileId = getDocId(file)
     const locale = getLocaleForPath(file)
     const index = getIndexByLocale(locale)
+    const sidebar = getSidebar(
+      siteConfig.site?.locales[locale]?.themeConfig?.sidebar ??
+        siteConfig.site?.themeConfig.sidebar,
+      fileId
+    )
+    const parentTitles = getParentTitles(sidebar, fileId.replace(/\.html$/, ''))
     // retrieve file and split into "sections"
     const html = await render(file)
     const sections =
@@ -138,7 +165,8 @@ export async function localSearchPlugin(
     // add sections to the locale index
     for await (const section of sections) {
       if (!section || !(section.text || section.titles)) break
-      const { anchor, text, titles } = section
+      let { anchor, text, titles } = section
+      titles = [...parentTitles, ...titles]
       const id = anchor ? [fileId, anchor].join('#') : fileId
       index.add({
         id,
diff --git a/src/shared/shared.ts b/src/shared/shared.ts
index 6f2b4f702062..bbc3e94e1b10 100644
--- a/src/shared/shared.ts
+++ b/src/shared/shared.ts
@@ -1,4 +1,9 @@
-import type { HeadConfig, PageData, SiteData } from '../../types/shared'
+import type {
+  HeadConfig,
+  PageData,
+  SiteData,
+  DefaultTheme
+} from '../../types/shared'
 
 export type {
   Awaitable,
@@ -14,6 +19,8 @@ export type {
   SiteData
 } from '../../types/shared'
 
+export type SidebarItem = DefaultTheme.SidebarItem
+
 export const EXTERNAL_URL_RE = /^(?:[a-z]+:|\/\/)/i
 export const APPEARANCE_KEY = 'vitepress-theme-appearance'
 export const HASH_RE = /#.*$/
@@ -200,3 +207,47 @@ export function treatAsHtml(filename: string): boolean {
 export function escapeRegExp(str: string) {
   return str.replace(/[|\\{}()[\]^$+*?.]/g, '\\$&').replace(/-/g, '\\x2d')
 }
+
+/**
+ * Get the `Sidebar` from sidebar option. This method will ensure to get correct
+ * sidebar config from `MultiSideBarConfig` with various path combinations such
+ * as matching `guide/` and `/guide/`. If no matching config was found, it will
+ * return empty array.
+ */
+export function getSidebar(
+  _sidebar: DefaultTheme.Sidebar | undefined,
+  path: string
+): SidebarItem[] {
+  if (Array.isArray(_sidebar)) return addBase(_sidebar)
+  if (_sidebar == null) return []
+
+  path = ensureStartingSlash(path)
+
+  const dir = Object.keys(_sidebar)
+    .sort((a, b) => {
+      return b.split('/').length - a.split('/').length
+    })
+    .find((dir) => {
+      // make sure the multi sidebar key starts with slash too
+      return path.startsWith(ensureStartingSlash(dir))
+    })
+
+  const sidebar = dir ? _sidebar[dir] : []
+  return Array.isArray(sidebar)
+    ? addBase(sidebar)
+    : addBase(sidebar.items, sidebar.base)
+}
+
+function addBase(items: SidebarItem[], _base?: string): SidebarItem[] {
+  return [...items].map((_item) => {
+    const item = { ..._item }
+    const base = item.base || _base
+    if (base && item.link) item.link = base + item.link
+    if (item.items) item.items = addBase(item.items, base)
+    return item
+  })
+}
+
+export function ensureStartingSlash(path: string): string {
+  return /^\//.test(path) ? path : `/${path}`
+}