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