I'm constructing long search queries joined with OR... There's a big chance that some of these terms are redundant because the search engine automatically searches for variations. Is there a way to know which search terms are redundant ? For example, for the search query "database" OR "list" OR "Collection" OR "Repository" OR " library", is there a way to shorten this query by removing the redundant items? Or at least identifying the redundant ones and then I can remove them manually?

the search engine automatically searches for variations

In the example you shared:

"database" OR "list" OR "Collection" OR "Repository" OR " library"

, all these are conceptually similar and will only retrieve results for each other when you use semantic search, along with a model who's training dataset has all those words. Otherwise, it's not an automatic thing

So I want this to function as a replacement for the regular google search engine.