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 write paper", "research what paper", "research site paper"
"research while papers" » "research where papers", "research which papers", "research what papers", "research white papers", "research while others", "research while part"

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