Try using search terms such as "leadership" and "management". Other terms such as "human resources" can be useful. If you have a specific search topic for an assignment such as "operations management", that can be the start of a good search as well.
Use OR between your search terms to broaden the search to include any of the terms.
Use AND between your search terms to narrow the search to include all the terms.
Find full text within the databases in html or pdf format.