Perhaps you should try some spelling variations:
"research progresses" » "research progress", "research processes", "research programmes"
"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 progresses") OR ((("research process") OR ("research problems"))))*.
• Removing quotes may allow a broader search: (( research progresses ) or ((( research process ) or ( research problems ))))*.