Perhaps you should try some spelling variations:
"research written paper" » "research write paper", "research within paper", "research writing paper", "research written after"
"research while paper" » "research where paper", "research which paper", "research what paper", "research white paper", "research while pair", "research while chapter"

You may be able to get more results by adjusting your search query.

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