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