Academic OneFile can be found in the list of databases. To start a subject search, click the Subject Guide Search control in the Search Options toolbar.

Type in a topic you wish to search:

Click Search. You may find your subject, or you may be guided to a different term.

When you have found your term, you may wish to click Subdivisions to zero in on a specific aspect of your subject.

Click on a specific subdivision of your topic to search for that aspect of your subject.

By using a subdivision you can keep the results focused to a manageable number of articles on the aspect you want.
Note: The MeSH heading subdivision or subheading that relates to the cause of a condition is "etiology."