Perhaps you should try some spelling variations:
"research proteases" » "research processes", "research progresses", "research process"
"research projects" » "research project"
"research progress" » "research program", "research project"
"research problems" » "research process", "research project", "research program"
"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 proteases"))) OR ((("research projects") OR ((("research progress") OR ("research problems")))))).
• Removing quotes may allow a broader search: (((( research prozess ) or ( research proteases ))) or ((( research projects ) or ((( research progress ) or ( research problems )))))).
• Adding a wildcard symbol may retrieve word variants: (((("research prozess") or ("research proteases"))) or ((("research projects") or ((("research progress") or ("research problems"))))))*.