precautions
Take care when creating your search expressions. They are used to formulate and refine your need for information, so if you take the time to be thoughtful, you will get more accurate, relevant results.
Different search programs often use different symbols and words to represent specific operators. As such, you should always check the online help files associated with your search program to identify which symbols are used to denote which operators. Check here for some extra search tips on Google.
