*If you enter multiple words within a single field, separate them by blanks. Search options include Boolean (AND, OR) and Phrase Searching.
 AND: "laser AND surgery" - Both the words should appear in the text. (reduces your search).
 OR: "laser OR surgery"- One of the words should appear in the text. (expands your search).
 PHRASE: "laser surgery"- Both of the words should appear in the exact order in the text. (further reduces your search).

Select boolean operators within a field: AND OR PHRASE