Perhaps you should try some spelling variations:
"research professor" » "research profession", "research prozess", "search processor"
"research processes" » "research procedures", "research progress", "research practices", "research progresses", "research projectes", "research programes"
"research projects" » "research project"
"research problems" » "research progress", "research project", "research program"
"research process" » "research progress", "research project", "research program"

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