Use More Words
The easiest way to narrow your search and the first thing you should try is to simply use more words in your query. The greater the detail you provide, the better the search engine is able to find precisely what you're looking for.
Use + to Require Words
Put a plus sign (+) in front of a search word and the search engine will make sure that ALL of the documents it returns contain the word. Example search: messenger +stability.
Use - to Exclude Words
Put a minus sign (-) in front of a search word and the search engine will make sure that NONE of the documents it returns contain the word. Example search: heat shock -avian.
Use AND, OR, NOT, AND NOT, ( )
This search engine supports full Boolean operators and syntax. You can use the AND, OR, NOT, and AND NOT operators, and parentheses ( ) for grouping . Example search: cell AND (somatic OR germinal).