So exact phrase searches do work in general (this is part of our integration test suite; but if you do find a case not covered by the explanation below, definitely let me know). However, the case described in the original post has a bit of a wrinkle to it: "stop words".
TL;DR: common words don't get indexed, so you can't search for them
The way searching works is that when a document is created or updated, it's added to several "inverted indices". Each index maps