Narrow down you results. Refine your search parameters. As you hone in your search, the results or hits will be more relevant to what you are looking for, if you know. Of course if you are interested in rocks and the Hudson river you could, use the comma to separate a lists or name. This increases the precision of your search.
Pipes search for one word, and then within that set of results, for another.
Natural Language Query is a search by phrase. The field name must be lowercase and followed immediately by a colon and then immediately followed by the search terms. Boolean logic is used to construct logical search statements using the logical operators AND , OR , and NOT . Frogs AND toads would search for frogs and toads together and exclude results that did not include both frogs and toads. Useful for narrowing, focusing and coordinating a search.