It is used to replace one character in a word or phrase. This is particularly helpful if the correct spelling of a word is unknown. This wildcard will expand a search that will give greater retrieval results. If searching just one field, such as author, skip this section. If searching in two or more fields, continue reading.
Connectors enable the user to search more than one field at the same time.
Click on and hold the arrow on the right of the box to see the other choices. The default is OR, however AND or AND NOT can be also chosen. OR Retrieves documents that meets one criteria OR the other. OR serves to expand a search. AND Retrieves only those records that meet both the first criteria AND the second criteria.