Perhaps you should try some spelling variations:
"research within paper" » "research working paper", "research within parser", "research within proper", "research within apex"
"research where paper" » "research what paper", "research work paper", "research why paper", "research where proper", "research where apex", "research where peter"

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 within paper") OR ("research where paper")).
• Removing quotes may allow a broader search: (( research within paper ) or ( research where paper )).
• Adding a wildcard symbol may retrieve word variants: (("research within paper") or ("research where paper"))*.