Most Higher Education materials fall into the 378 call number range.
It's usually best to start with a keyword search, but subject headings applied to relevant books can help to refine your results. Open the item record of a book that interests you. Scroll down to the clickable subject headings, and run another search to explore similar books.
You can also browse the headings associated with a particular topic as a way of getting started with your research.
Suggested Subject searches (use these words phrases alone or in combinaton as subjects):
If you interested in a specific aspect of higher education, try combining that idea with one of the suggest subjects above
The HEP ... higher education directory
Teaching Online by 
Higher Education and the Civil Rights Movement by 
Educational Change by