so.cl

Google dorks for searching Google Drive.

Spreadsheets:

site:docs.google.com inurl:/spreadsheets/d/ "<KEYWORD>"

Documents:

site:docs.google.com inurl:/document/d/ "<KEYWORD>"

Files:

site:drive.google.com inurl:/file/d/ "<KEYWORD>"

Folders:

site:drive.google.com inurl:/drive/folders/ "<KEYWORD>"

Obviously, replace <KEYWORD> with the search term.

For example, typing site:docs.google.com inurl:/spreadsheets/d/ "passwords" into the Google Search textfield will redirect you to this search page, with all kinds of goodies.