Perhaps you should try some spelling variations:
"research progress" » "research program", "research project", "research projects"
"research problems" » "research project", "research program", "research projects"
"research process" » "research projects", "research project", "research program"

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 progress") OR ((("research process") OR ("research problems"))))*.
• Removing quotes may allow a broader search: (( research progress ) or ((( research process ) or ( research problems ))))*.