Perhaps you should try some spelling variations:
"research states paper" » "research status paper", "research state paper", "research stages paper", "research state papers"
"research sites paper" » "research skills paper", "research times paper", "research sites peer", "research eines paper"
"research write papers" » "research white papers", "research written papers", "research site papers", "research white paper", "research waste papers"

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 sites paper") OR ("research states paper"))) OR ("research write papers"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research sites paper\") OR (\"research states paper\"))) or (\"research write papers\"))*".
• Removing quotes may allow a broader search: (((( research sites paper ) OR ( research states paper ))) or ( research write papers ))*.