Perhaps you should try some spelling variations:
"research progresses" » "research progress", "research processes", "research programmes"
"research problemses" » "research problem", "research processes", "research problemy", "research progresses", "research projectes"
"research professor" » "research profession", "research process", "research processes"
"research problems" » "research progress", "research process", "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 problems"))) OR ((("research progresses") OR ("research problemses")))).
• Removing quotes may allow a broader search: (((( research professor ) or ( research problems ))) or ((( research progresses ) or ( research problemses )))).
• Adding a wildcard symbol may retrieve word variants: (((("research professor") or ("research problems"))) or ((("research progresses") or ("research problemses"))))*.