Perhaps you should try some spelling variations:
"research written paper" » "research write paper", "research writing paper", "research twitter paper", "research written after"
"research within paper" » "research working paper", "research within parser", "research within proper", "research within apex"
"research white paper" » "research while paper", "research write paper", "research what paper"

Try widening your search to All Fields.

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