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I like Tiddlywiki, though it's not what you're looking for. I'm curious what you've found lacking in note search tools that haven't been "advanced".

Cherrytree is nice, notes are organised in a hierarchical tree, stored in sqlite database or in XML. You can edit either in text or in rtf.

https://www.giuspen.com/cherrytree/

However now I just use text or markdown files organised by theme in folders. I search with grep, I can use versioning, and I can edit with with my favorite text editor. Simplest solution :)

I can't tell you how badly I want to inject a bad 'vim' joke, here! :-)

One definitely worth checking out is Obsidian.