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 while papers" » "research where papers", "research which papers", "research what papers", "research white papers", "research while others", "research while part"
"research site paper" » "research scope paper", "research say paper", "research science paper", "research size paper", "research white paper", "research state 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 while papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research site paper\") OR (\"research sites paper\"))) or (\"research while papers\"))".
• Removing quotes may allow a broader search: (((( research site paper ) OR ( research sites paper ))) or ( research while papers )).
• Adding a wildcard symbol may retrieve word variants: (((("research site paper") OR ("research sites paper"))) or ("research while papers"))*.