Generally, many databases will search two words together as a phrase. Using double quotation marks will also let you search by phrase in just about every database. EBSCOhost databases have many nifty search options under search modes. Proquest databases automatically search two words together as a phrase.
- And combines search terms so that each search result contains all of the terms. For example, dogs and fleas finds articles that contain both terms
- Or - combines search terms so that each search result contains at least one of the terms. For example, dogs or fleas finds results that contain either term.
- Not - excludes terms so that each search result does not contain any of the terms that follow it. For example, dogs not fleas finds results that contain the term dogs but not the term fleas.
See how the use of Boolean operators affects a search in Academic Search Premier
- Mexico drugs 694 results
- Mexico and drugs 6542 results
- Mexico or drugs 802136 results
- Mexican drugs 664 results
- Mexico and drugs and gangs 312 results
- drug trafficking 3584 results
- "drug trafficking" not Mexico 3074 results