Thank you all for your advice. I understand that Google is a search engine and that, as such, it has limitations. I was just a bit frustrated, probably because I'm sometimes told by English Forums users to use Google to verify my sentence structures... So far, my experience with Google has been exasperating at best.
Just to clarify, English IS my native language... HOWEVER, I suffer from a condition which makes it impossible for me to filter information. In other words, my brain absorbs every bit of information it's exposed to, including, alas, grammatical mistakes and unidiomatic expressions ... And since I live in a cosmopolitan area, I often have to interact with people whith a poor command of English. When that happens, I literally have to "relearn" how to speak, much as an Internet user would debug their computer after visiting seedy websites... It can take me weeks and sometimes even months to be able to speak and write properly again. Does this make sense to any of you?
P.S.: Does my post contain any mistakes? I can't help but second-guess myself because of my condition...