The advanced search screen may be accessed by clicking on the link at the top of the search screen page.
From the pull down beside the search term box you may select Keyword, Subject or Title. Two rows are available by default for two items, but more rows may be added by clicking on the AND NOT or OR button. The second section has the option to limit the search by Format, Language, Library Location and Year. The bottom section pertains to articles only and allows you to limit the article search to Full Text, Available in Library Collection and Article Expanders.