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

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 process") OR ((((("research progress") OR ("research project"))) OR ("research problems")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research prozess\") or (\"research proteases\"))) or (((\"research process\") or (((((\"research progress\") OR (\"research project\"))) or (\"research problems\"))))))".
• Removing quotes may allow a broader search: (((( research prozess ) or ( research proteases ))) or ((( research process ) or ((((( research progress ) OR ( research project ))) or ( research problems )))))).
• Adding a wildcard symbol may retrieve word variants: (((("research prozess") or ("research proteases"))) or ((("research process") or ((((("research progress") OR ("research project"))) or ("research problems"))))))*.