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
mentor* (finds mentor, mentors, mentoring, etc.)
(college or "higher education")
STEM and mentor*
Put it all together:
(college or "higher education") and STEM and mentor*