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