Want to learn more about the people who are going to compete with you? These two resources cover most US businesses, but ReferenceUSA is going to be stronger on local companies.
AND link words by AND to search for all words in the same resource
OR link words by OR to search for one word or another (instead of both/all words)
NOT to eliminate results with a certain term
“Quotations” – add quotations to a group of two or more words to search for the exact phrase