Advanced search: Query builder
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Expand search by adding synonyms (select OR)
Adding synonyms, such as feline in addition to cat, helps expand your search to find papers that use different words for the same topic. Enter and Add your first word, then Add a synonym using the OR drop-down selection. Only one of terms must be present to appear in search results.
OR broadens a search, only one term must be present.
Narrow search by adding topics (select AND)
You can narrow your search to only papers that contain two or more topics, such as cat and toxoplasmosis. Enter and Add your first word, then Add another topic using the AND drop-down selection. Only papers with both topics will be returned in search results.
AND narrows a search, both terms must be present.
Refine search by excluding a word (select NOT)
To find papers that exclude certain words, Add the excluded term using the NOT drop-down selection. For example you may want to find a paper that includes cat but excludes dog.
NOT refines a search, one term must be present, while the other term is excluded from the results.
Layer concepts to build a more complex query
You can build a more complex search query in layers. For example, you can look for a topic and it’s synonyms, then add another topic, and then exclude a word. Each concept will be grouped by the Query builder, creating a layered effect. The resulting search query might look like this: (((cat OR feline) AND toxoplasmosis) NOT dog). This would find papers that contain either cat or feline, as well as toxoplasmosis, but not dog.