AND is a Boolean operator that narrows your results to be more specific.
NOT is another Boolean operator that will narrow your results.
Many databases offer a menu containing a variety of ways to limit your searches both before you search and on your results page.
In EBSCO databases such as RILM or CINAHL, under the search box on the results page, there will be limiting options to help you narrow your search. The All Filters button provides a comprehensive list of options for you to further limit your search, which is similar to the Refine Results limiters on the old EBSCO database interface.
Here are the limiters under the search box in RILM:
Here are All Filters menu options in RILM:
PsycInfo also provides options on the All Filters menu that you can use to choose characteristics for your population such as gender, age, and population. You can also use Methodology to look for specific types of studies such as literature reviews and empirical studies.
OR expands the number of results you will get. When you use OR to connect two keywords, your article results will include some articles with only your first keyword, some articles with only your second keyword, and some articles with both keywords. In the example below for anxiety OR stress, some articles will include stress, some will include anxiety, and some will include both stress and anxiety.
Different articles use different synonyms, or words with same meaning.
Another way to expand your results is called truncation. You can search for multiple words at the same time that start with the same letters by placing a * after the letters.
Here are some examples:
This page contains advanced search strategies to help you hone your searches.