Boolean operators AND OR NOT
AND=both/all OR=any NOT=exclude
Truncation symbol, [an asterisk (*), dollar sign ($), or plus sign (+), etc.], with the root/stem of a word broadens your search to include various wording endings:
child*=child or children or childhood
Wildcard symbol may also be used to replace a single character to include different spellings:
wom?n for women or woman
Databases use different symbols so check the searching help.