Keyword searching (generally) works best for finding articles on a topic
If you get too many results, try limiting to a particular subject - usually there is a list of subject links on one side of the screen.
The same tricks to help you find books in the catalog, will help you find articles
(college or university or "higher education")
student and success
motivat* (finds motivate, motivates, motivational, etc.)
Put it all together:
(college or university or postsecondary) and motivat* and "student success"