Here are two great references for learning how to get the most out of each and everyone of your google searches. Over time you will become much more productive. This is without a doubt an important 21st Century skill.

http://www.google.com/help/cheatsheet.html
Official Google cheatsheet.

http://www.googleguide.com/advanced_operators_reference.html
Google advanced operators cheatsheet from Google Guide.

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I've been promoting 'using google the right way' - This is a great resource to add to it.
Beyond Google - Great research resources for education.
Research Beyond Google: 119 Authoritative, Invisible, and Comprehensive Resources | OEDb