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