Ehhh, I write very specific search terms, with quoted elements, and I still get shockingly irrelevant results. I'd literally rather get a "no useful results" response rather than hundreds of pages of results that literally DO NOT CONTAIN the terms I typed into the search box.
If you put the search terms in quotation marks it will only show results where that term appears verbatim on the page. Also searching -keyword will exclude search results where that word is present.