Under Search Options on the Advanced Search screen, the search modes offer four different ways to conduct a search. You can combine a search mode with expanders such as Apply related words, and/or with limiters such as Full Text or Publication Type.
Select from:
Boolean/Phrase – Supports any Boolean searching or exact phrase searching. Stop words are ignored when part of phrases being searched.
Find all of my search terms – Auto AND all search terms entered (e.g. web AND accessibility)
Find any of my search terms – Auto OR all search terms entered (e.g. web OR accessibility)
SmartText Searching - You can copy and paste large chunks of text to search for results. SmartText Searching leverages a technology that summarizes text entered to the most relevant search terms then conducts search. This search mode is not available for all databases.