AND only returns search results that contain both keywords
OR returns results that include either keyword
NOT excludes one or more of your keywords
If you're coming up with too many or too few results, try these tips! Below are a few examples using Web of Science. Most of them can be used in other databases as well.
Broaden your search
Narrow your search
Web of Science has a lot of features to make narrowing your search and finding similar documents easier for you. Here are a few of them:
On the main search page
On the results page
On an individual record page
*And remember: You can save marked records and email them to yourself or upload them directly to Endnote.*