Basic Search Help - http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=134479
Search Using Modifiers - http://www.google.com/support/websearch/bin/answer.py?hl=en&answer=136861&rd=1
Infotopia
A safe search engine for students which includes only sites recommended by librarians, teachers, and library and educational consortia.
Google Scholar to find academic, peer-reviewed articles on your topic. Often these are articles that you would not find in typical Google search. Google Scholar is also useful for finding court rulings and patent filings. Here’s a video about using Google Scholar.
The advanced search menu is often overlooked by students. It is found by opening the advanced menu that appears under the “tools” menu on the search results page. In that menu you will find tools for refining search results by file type, domain, language, and more. Here’s a demo of how to refine search results according to date.