Topic: Google Search Operators and special characters
The following table lists the search operators that work with each Google search service
1- Web Search: allinanchor:, allintext:, allintitle:, allinurl:, cache:, define:, filetype:, id:, inanchor:, info:, intext:, intitle:, inurl:, link:, related:, site:
2- Image Search: allintitle:, allinurl:, filetype:, inurl:, intitle:, site:
3- Groups: allintext:, allintitle:, author:, group:, insubject:, intext:, intitle:
4- Directory: allintext:, allintitle:, allinurl:, ext:, filetype:, intext:, intitle:, inurl:
5- News: allintext:, allintitle:, allinurl:, intext:, intitle:, inurl:, location:, source:
6- Product Search: allintext:, allintitle:
Reference : http://www.googleguide.com/advanced_operators.html