Enter a search term, consult our Tips for Searching ▾, or browse the categories below.
|OPERATOR and EFFECT||Example|
|AND narrows your results by saying all the search terms must be present in each result, although they do not necessarily have to be together.||crop AND yield|
|OR broadens your results by saying either search term is present in each result.||crop OR yield|
|NOT narrows your results by saying a search term must not be present in each result.||crop NOT yield|
|Quotation Marks narrow your results by saying the entire phrase must be present in each result.||"crop yield"|
|An asterisk is like a wild card. Any other element can be part of the search term, which means a result can include other forms of the word, like children for child*.||child*|