The term "GHDB" was allegedly coined by Johnny Long, which started to maintain a number of "google-based" queries that would eventually reveal security flaws in websites (without one having to scan the site directly for that vulnerability).

Google Hacking Database (GHDB) Tool is a unique application that will allow you to search for "google-like" queries within a saved spider data. N-Stalker  GHDB Tool can be invoked by clicking on "GHDB Tool" button under "Miscellaneous Tools":

Here are the next steps to use N-Stalker GHDB Tool: