The library catalog only looks for the words you enter in a few places --book title, author's name, publisher, and official subjects assigned to the book. Using broad, general search terms is usually better than being too specific.
Put the word AND between search terms:
August Wilson AND criticism
victorian AND society
victorian AND gender
streetcar named desire AND criticism
Use an asterisk (*) to find variations of a word. psychoanaly* would find anything referring to psychoanalyze or psychoanalytical.
Use quotation marks for phrases: "psychoanalytical theory"