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

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 process") OR ("research progress"))) OR ("research problems"))) OR ("research projects")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research process\") OR (\"research progress\"))) or (\"research problems\"))) or (\"research projects\"))".
• Removing quotes may allow a broader search: (((((( research process ) OR ( research progress ))) or ( research problems ))) or ( research projects )).
• Adding a wildcard symbol may retrieve word variants: (((((("research process") OR ("research progress"))) or ("research problems"))) or ("research projects"))*.