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