A Boolean "and" between
words is assumed; that is, documents will be retrieved that have
all the specified words. If you wish to find all the documents that
have any word, then use "or" between your search words.
To widen a search use an asterisk (*) at the end of a word. For
example, the search "comput*" would retrieve documents that have the
words "computer", "computing", "computation", etc.