Perhaps you should try some spelling variations:
research professor » research profession, research progresson, research prozess
research processes » research procedures, research projects, research progress
research process » research progress, research projects, research problems
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 (research process))) OR (search procedure)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((research professor) or (((((research processes) OR (research process))) or (search procedure))))".
• Adding a wildcard symbol may retrieve word variants: ((research professor) or (((((research processes) OR (research process))) or (search procedure))))*.