Perhaps you should try some spelling variations:
research problems » research progress, research project, research program
research prozess » research progress, research propels, research processes
research process » research progress, research projects, 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 prozess ) OR ((( research process ) OR ( research problems )))).
• Adding a wildcard symbol may retrieve word variants: (( research prozess ) or ((( research process ) or ( research problems ))))*.