Perhaps you should try some spelling variations:
"research profession" » "research professional", "research progression", "research professionals"
"research professor" » "research progresson", "search processor", "research professional"
"research processes" » "research procedures", "research projects", "research practices", "research projectses", "research problemses", "research projectes"
"research progress" » "research program", "research project", "research projects"
"research prozess" » "research propels", "research proteases", "research projects"
"research process" » "research projects", "research problems", "research project"

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