I'm not sure if my memory is playing tricks on my, but I've found quotes unreliable. Google will spit out "close" suggestions that have nothing to do with what I requested, despite using quotes.

Google also happily returns results which do not fulfill even the "close" suggestions: e.g. I ask for three words, Google searches for those three words, and returns a bunch of pages that contain only two or one of those words. Google, that's not what I asked for.

Google's attempts to tweak my queries and also return results that don't fulfill all requirements makes it much less useful to me, because they usually backfire. I don't want my queries tweaked -- I want exactly what I asked for, and only what I asked for. If I made a mistake, I can figure it out and fix it myself.