Perhaps you should try some spelling variations:
research professor » research profession, research process, research prozess
research processes » research process, research procedures, research projects
search procedure » search procedures, search process

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((research professor) OR (((research processes) OR (search procedure)))).
• Adding a wildcard symbol may retrieve word variants: ((research professor) or (((research processes) or (search procedure))))*.