Keywords are those words which are indexed and can be found by the system. They comprise any element in a title, surname, or corporate name, except for articles, prepositions, and conjunctions.
Word order is irrelevant in keyword searching.
A variety of subject headings are used in the catalogue, including Library of Congress and specialist schemes for Law and Medicine. General terms can of course be used as keywords, but the search needs to be combined either with a name keyword or with further title keywords.