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

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 (research process)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((research professor) or (((research processes) OR (research process))))".
• Adding a wildcard symbol may retrieve word variants: ((research professor) or (((research processes) OR (research process))))*.