Perhaps you should try some spelling variations:
"research professor" » "research profession", "research process", "research professional"
"research processes" » "research process", "research procedures", "research projects"
"search processor" » "search process", "search processes", "search processing"
"research prozess" » "research process", "research progress", "research proteases"
"research propels" » "research process", "research prospects", "research proposals"

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