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