[Admin Search] Improve the admin search

[tudoramariei]

Describe the bug
Currently, the search will only include some of the search results, even those that are the exact name of the page. This last use-case might be because it's a site with many pages, and the page I'm looking for is one of the very first created, but I need to figure it out.

To Reproduce
Possible prerequisite: These results were reproduced for a WF instance with >300 published pages, and most of the issues were with pages created a long time ago (the first 19 IDs were consistently not being found)

Steps to reproduce the behavior:

1. Log in as an admin/editor on the WF site
2. Click on the search bar from the top
3. Search for a page name you would expect to find
4. The chances of finding the page might not be 100%

Expected behavior
The following [search queries] -> search result combinations should work (that means the expected search result must be returned).

• Diacritics are a constant issue: [Cum Funcționăm, funcționăm, functionam, funct] -> Cum Funcționăm
• Sometimes the exact name doesn't match [Health for Romania] -> Health for Romania (this worked for shorter page names created not long ago)

Additional context
The testing was done in a WF instance deployed into production, so adding more context is complicated. Contact @tudoramariei for more details on how to reproduce the issues.