Perhaps you should try some spelling variations:
research professor » research profession, research progresson, research processes
research progress » research program, research project, research projects
research prozess » research propels, research processes, research proteases
research process » research projects, research problems, research project

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