Case is ignored, accents should be omitted, and apostrophes are not required. Single characters and a few common words are also ignored. Any word ending with an asterisk is treated as a prefix. Intersect the results of the given search with the previous search. Several of these commands may be combined on a single line.
Commands are handled in the order in which they appear-there is no precedence.
Do not intersect but combine the results of the given search with the previous search.