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