The subject term used for careers in the catalog is Vocational Guidance.
Doing a Subject search for Vocational Guidance returns a list of items that discuss multiple careers in different areas.
To find books on a particular career field do a Subject search for the topic and add Vocational Guidance
Ex. Art Vocational Guidance
OR
Do a Keyword search using the topic and Vocational Guidance
Ex. Nurses and Vocational Guidance