There are a number of techniques to use that can refine your search results when researching information. You can use these strategies when looking for information from the library databases or from a search engine such as Google.
One of the easiest ways to refine your search is to use the Boolean operators. The three most common Boolean operators are AND, OR, and NOT, but there are others available. The operators AND and NOT will narrow your search and OR will usually increase your search results. (The AND operator is not necessary in Google; Google automatically adds the AND between words unless a phrase is put in quotation marks.)
The images below explain differences between the Boolean operators.