Sometimes when I search for articles by keyword, I get no results.

For the above reasons, I can't find what I wrote in the past, so I wasted a lot of time searching through about 100 documents...

This isn't the first time this has happened to me... I don't think I can handle it if the number of articles increases... Please solve it...

Usually, words that I put in single quotes for emphasis don't search well (not always, sometimes it works even if I put them in '').

Also, when searching for words that appear in multiple documents, the order of results is jumbled.