I Personally think these type searches are similar to Phishing.
There is an unusual amount of File Sharing Members that actually and unknowingly Share EVERYTHING on their HDD. This is when and why you may see these strange search results.
Basiclly they are Phishing for Personal Data i.e. Bank Accnt. #'s, CC #'s, Policy #'s, or anything they can get their grubby little hands on.
Once they retrieve enough personal info, the identity of the victim can now be stolen.
My .02 cents