Perhaps you should try some spelling variations:
"research profession" » "research professional", "research progression", "research professionals"
"research professor" » "research processes", "search processor", "research professional"
"research prozess" » "research progress", "research processes", "research proteases"
"research propels" » "research prospects", "research proposals", "research projects"
"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 ("research profession"))) OR ((("research prozess") OR ("research propels"))))) OR ("research process")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research professor\") or (\"research profession\"))) or (((\"research prozess\") OR (\"research propels\"))))) or (\"research process\"))".
• Removing quotes may allow a broader search: (((((( research professor ) or ( research profession ))) or ((( research prozess ) OR ( research propels ))))) or ( research process )).
• Adding a wildcard symbol may retrieve word variants: (((((("research professor") or ("research profession"))) or ((("research prozess") OR ("research propels"))))) or ("research process"))*.