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