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

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 progress ))) OR ( research problems ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( research prozess ) OR ( research progress ))) or ( research problems ))*".