When trying to find a way around Search for Tags not supporting auto complete, I tried searching on a word in the tag’ s full hierarchical path (not using ‘Tags:’), and that worked!
BUT! When I searched on two words (not using ‘Tags:’), both found in Tags on the note, Search would not find the page.
I find this odd, and wonder why it would work this way.
But when searching the full hierarchical path, you are likely finding an exact match as a string, so it finds it. It’s not searching the tag’s structure. It’s just matching the exact phrase as you typed it.