[missedthecue]

Under normal usage, google will search for synonyms of the keywords you typed. But I have never experienced it ignoring quotes.

[avereveard]

If your term is specific enough it will ignore it the first time around even if in quotes, and you have to click on the "search this term for real" link underneath

Google search is however personalized per user account in mysterious ways, so there's that at play as well