Using my google-fu ;) I found this link which may or may not be any good(http://www.googleguide.com/advanced_operators.html http://www.googleguide.com/advanced_

Using my google-fu ;) I found this link which may or may not be any good(http://www.googleguide.com/advanced_operators.html http://www.googleguide.com/advanced_operators.html). I have never used operators myself, I think just the way you structure and choose your words wisely has the most impact.