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

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 projects"))) OR ("research problems")))).
• Removing quotes may allow a broader search: (( research prozess ) or ((((( research process ) or ( research projects ))) or ( research problems )))).
• Adding a wildcard symbol may retrieve word variants: (("research prozess") or ((((("research process") or ("research projects"))) or ("research problems"))))*.