Anyone have idea for this case?

You need to add the thumbs into the results using a hook from src/search.js 'filter:search.contentGetResult' should work, you can also replace the embed shortcode in the same hooks.

To display the thumbs in the page you need to modify the template at https://github.com/NodeBB/nodebb-theme-harmony/blob/main/templates/partials/search-results.tpl and replace html with your own and use the thumbnails.

@baris i finished for remove shortcode, but I don't see thumb when i debug data value

filterSearchContentGetResult: async function (data) {
		const posts = data.result.posts;
		

		for (let post of posts) {
			post.content = post.content.replace(/^\[embed-iframe\].*$/gm, '');
		}

		return data;
	},

This is data value:

{
    pid: 41238,
    tid: 41238,
    content: '<p dir="auto">content <br />\n' +
      '[embed-iframe] [{"name": "Video 1", "link": "https://www.youtube.com/embed/1cr_uPGOCeE?si=dc0ygHELF9Opgf9X"}]</p>\n',
    uid: 1,
    timestamp: 1735617649489,
    deleted: false,
    upvotes: 0,
    downvotes: 0,
    replies: 0,
    handle: undefined,
    votes: 0,
    timestampISO: '2024-12-31T04:00:49.489Z',
    user: {
      uid: 1,
      username: 'user',
      userslug: 'user',
      picture: null,
      status: 'online',
      uploadedpicture: undefined,
      lastonline: undefined,
      fullname: undefined,
      displayname: 'user',
      'icon:bgColor': '#673ab7',
      'icon:text': 'A',
      lastonlineISO: undefined
    },
    topic: {
      uid: 1,
      tid: 41238,
      title: 'embed logs',
      cid: 2,
      tags: [Array],
      slug: '41238/embed-logs',
      deleted: 0,
      scheduled: false,
      postcount: 1,
      mainPid: 41238,
      teaserPid: null,
      timestamp: 1735617649441,
      titleRaw: 'embed logs',
      timestampISO: '2024-12-31T04:00:49.441Z'
    },
    category: {
      cid: 2,
      name: 'General Discussion 5',
      icon: 'fa-comments-o',
      slug: '2/general-discussion-5',
      parentCid: 0,
      bgColor: '#59b3d0',
      color: '#ffffff',
      backgroundImage: '',
      imageClass: 'cover'
    },
    isMainPost: true
  },

You need to load it yourself using the topic values and the method thumbs.load