You could swap to Windows. The search there never finds anything, not even files that you know exist in the root of the directory you are searching inside.
On my previous laptop, Windows 10 search was totally broken. For several years and despite me occasionally spending an hour trawling for fixes.
On my new laptop, which I bought a year ago, still running Windows 10, it has always worked perfectly. Not sure if MS fixed something, or some kind of indexing error happened on my old laptop.
