STEP 2 - add another keyword or select "subject" instead of keyword as the field in which to search. Searching as a subject will retrieve items that are about stress and doesn't just mention stress.

Keyword Search Term: stress
Additional Keyword Search Term: college OR universit*
Example outcome: Information on stress (Psychology) United States, biomedical materials, Sweden, universities & colleges, strains & stresses, anxiety, nursing ethics, teachers, college teachers

-----OR----

Subject Search Term: stress
Example outcome: Information on stress (psychology), oxidative stress, stress (physiology), strains & stresses, mental health, stress management, stress waves, psychology, post-traumatic stress disorder, anxiety