Searching is an iterative process. Enter relevant terms. Then examine the resulting titles and subject headings for alternative words to characterize your topic. Make note of the best results from the initial search, and search again on additional terms.
A search for Islamic Art retrieves approximately 1500 books, so there is a wealth of locally available information to help your research. Additional sources will be retrieved for alternative search terms or more specific search terms, such as:
Islamic architecture or Islamic calligraphy or Timurid art or Safavid art or Iran and art or Cairo and art or Middle East and art.