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