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* |