If there is anyone who doesn't know all the intricacies of searching on Goggle, there is a features page with links to every question you could have regarding making a search and refining the results.

http://www.google.com/help/features.html

There is a basic search page. Then the advanced search page (http://support.google.com/websearch/bin/answer.py?hl=en&answer=136861&rd=1) shows how to use features such as:
phrase search, single word, search within a specific website, terms you want to exclude, fill in the blanks, 'or' , exceptions

Another page (support.google.com/websearch/bin/answer.py?hl=en&answer=134479#search_results&rd=1) show tips on how to get the best results.

You can also set your own search preferences. See http://support.google.com/websearch/bin/answer.py?hl=en&answer=35892&rd=1

I think anyone who has looked at this information will find that they get great results from Google searches. I am always astounded by how accurate they are by following a few basic guidelines.