Go to the list of subject-specific databases. These databases index articles by subject area and are mostly proprietary (WU Libraries subscribe to them).
Choose a database that is related to your subject of interest.
Search the database using keywords and phrases (important words and concepts) that describe your topic.
Look through the resulting citations and determine which of the articles most closely match your topic. Note: Typically, many but not all articles will be available in full-text in the database.