Perhaps you should try some spelling variations:
"research professor" » "research profession", "search processor", "research professional"
"research processes" » "research procedures", "research projects", "research practices", "research projectses", "research problemses", "research projectes"
"research progress" » "research program", "research problems", "research project"
"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 prozess") OR ("research process"))) OR ("research progress"))))) OR ("research processes")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research professor\") or (((((\"research prozess\") OR (\"research process\"))) or (\"research progress\"))))) or (\"research processes\"))".
• Removing quotes may allow a broader search: (((( research professor ) or ((((( research prozess ) OR ( research process ))) or ( research progress ))))) or ( research processes )).
• Adding a wildcard symbol may retrieve word variants: (((("research professor") or ((((("research prozess") OR ("research process"))) or ("research progress"))))) or ("research processes"))*.