Perhaps you should try some spelling variations:
"research twitter paper" » "search twitter paper", "research better paper", "research letter paper", "research twitter power", "research twitter chapter", "research twitter barter"
"research written paper" » "research within paper", "research writing paper", "research wissen paper", "research written after"
"research write paper" » "research site paper", "research waste paper", "research while paper", "research white paper", "research writing paper"
"research white papers" » "research while papers", "research what papers", "research where papers", "research white paper", "research state papers", "research late 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 write paper") OR ("research white papers"))) OR ((("research written paper") OR ("research twitter paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research write paper\") or (\"research white papers\"))) or (((\"research written paper\") OR (\"research twitter paper\"))))".
• Removing quotes may allow a broader search: (((( research write paper ) or ( research white papers ))) or ((( research written paper ) OR ( research twitter paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("research write paper") or ("research white papers"))) or ((("research written paper") OR ("research twitter paper"))))*.