I believe they don't show certain phrases in the suggested searches but don't disallow you to search and receive results for those phrases. A great example of

I believe they don't show certain phrases in the suggested searches but don't disallow you to search and receive results for those phrases. A great example of this would be that they stopped autosuggesting the word torrent at some point in time despite returning torrent results if you searched for it explicitly. They stopped suggesting, but didn't stop indexing.