Search Apple Apps for iOS 6

Paste the following text:
site:itunes.apple.com/us/app/ "Requires iOS 6.0 or later" "your_keyword"

ex:
site:itunes.apple.com/us/app/ "Requires iOS 6.0 or later" "google drive"

It works!

This idea come from LazerLord10 and I have refined it.