Perhaps you should try some spelling variations:
"research professor" » "research profession", "research processes", "research professional"
"search processor" » "search process", "search processes", "search processing"
"research prozess" » "research progress", "research propels", "research processes"
"research process" » "research progress", "research projects", "research problems"

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