Perhaps you should try some spelling variations:
"research written paper" » "research write paper", "research within paper", "research writing paper", "research written after"
"research white papers" » "research while papers", "research write papers", "research what papers", "research white paper", "research state papers"
"research site paper" » "research sites paper", "research scope paper", "research say paper", "research size paper", "research white paper", "research state paper"

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