Basic search defaults to searching all text fields. The advanced search allows you to choose which field to search, using tthe drop-down menu next to the search box.
You can perform simple searches by just typing in some keywords or more sophisticated searches by using boolean operators (AND, OR, NOT, NEAR), grouping words/phrases using parentheses or quotes, and using the wild card character "*". Here are some example search queries:
finds records containing both 'information' and 'retrieval'
same as above
finds records containing 'information' or 'retrieval'
finds records containing both 'information' and 'retrieval', where the two terms are located in close proximity to each other within the document
finds records containing the exact phrase 'information retrieval' -- this would not match a document with the phrase 'information systems retrieval', for example
finds records containing 'information' but not 'retrieval'
finds records containing 'web', plus both 'information' and 'retrieval', where the two terms are located in close proximity to each other within the document
finds records containing words starting with 'web' -- this wildcard only works at the end of a word or phrase, for example, "information ret*" or info*, but not "info*tion"ess.