Perhaps you should try some spelling variations:
"research problems" » "research progress", "research project", "research program"
"research projects" » "research project"
"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 prozess") OR ("research projects"))) OR ("research problems"))*.
• Removing quotes may allow a broader search: (((( research prozess ) or ( research projects ))) or ( research problems ))*.