Perhaps you should try some spelling variations:
research profession » research professional, research progression, research professionals
research professor » research process, research processes, search processor
research prozess » research process, research progress, research propels

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