Boolean operators define logical relationships between terms in a search. Write them in UPPERCASE.
AND - each result contains all the search terms (the same as Find all my search terms)
OR - each result contains at least one search term (the same as Find any of my search terms)
NOT - results do not contain the specified term(s)
AND takes precedence over OR
Nested searches - search in brackets is carried out first:
(mouse OR rat) AND trap
Enclose in quotes to search for given words in the same order and adjacent:
"black hole evaporation"
Also search within the full-text of the articles
Check this box in Search Options to expand the search - but use with care as it may return a great number of results, with many less relevant to the search topic.