Perhaps you should try some spelling variations:
"research sites paper" » "research skills paper", "research scopes paper", "research says paper", "research sciences paper", "research states paper", "research times paper", "research sites peer"
"research state paper" » "research status paper", "research strategy paper", "research station paper", "research state papers", "research late paper", "research same paper"
"research write papers" » "research white papers", "research written papers", "research waste papers", "research white paper"
"research site paper" » "research scope paper", "research say paper", "research science paper", "research size paper", "research white paper", "research fine 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 site paper") OR ("research sites paper"))) OR ("research state paper"))) OR ("research write papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research site paper\") OR (\"research sites paper\"))) or (\"research state paper\"))) or (\"research write papers\"))".
• Removing quotes may allow a broader search: (((((( research site paper ) OR ( research sites paper ))) or ( research state paper ))) or ( research write papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("research site paper") OR ("research sites paper"))) or ("research state paper"))) or ("research write papers"))*.