Below form uses 2 advance operators site and filetype. The filetype is limited to certain extensions. You can use the query formation to add your own operators like .mysql, ,php etc
Description: Limit the search query to a specific domain or web site.
Advance Operator: filetype
Description: Limit the search to text found in a specific file type
Google hacking, sometimes, referred to as Google dorking, is an information gathering technique used by an attacker leveraging advanced Google searching techniques. Google hacking search queries can be used to identify security vulnerabilities in web applications, gather information for arbitrary or individual targets, discover error messages disclosing sensitive information, discover files containing credentials and other sensitive data.