Perhaps you should try some spelling variations:
"research written paper" » "research write paper", "research within paper", "research writing paper", "research written after"
"research waste paper" » "research fast paper", "research water paper", "research east paper", "research white paper"
"research white papers" » "research while papers", "research write papers", "research what papers", "research white paper", "research state papers"
"research past paper" » "research part paper", "research paper paper", "research pass paper", "research post paper", "research cast 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 waste paper") OR ("research past paper"))) OR ("research written paper"))) OR ("research white papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"research waste paper\") OR (\"research past paper\"))) or (\"research written paper\"))) or (\"research white papers\"))".
• Removing quotes may allow a broader search: (((((( research waste paper ) OR ( research past paper ))) or ( research written paper ))) or ( research white papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("research waste paper") OR ("research past paper"))) or ("research written paper"))) or ("research white papers"))*.