Perhaps you should try some spelling variations:
"research white paper" » "research while paper", "research what paper", "research site paper"
"research write paper" » "research written paper", "research site paper", "research waste paper", "research white papers"
"research past paper" » "research part paper", "research paper paper", "research pass paper", "research cast paper", "research last paper"
"research post paper" » "research part paper", "research phase paper", "research path paper", "research cost paper", "research poster paper", "research best 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 write paper") OR ((("research past paper") OR ("research post paper"))))) OR ("research white paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research write paper\") or (((\"research past paper\") OR (\"research post paper\"))))) or (\"research white paper\"))".
• Removing quotes may allow a broader search: (((( research write paper ) or ((( research past paper ) OR ( research post paper ))))) or ( research white paper )).
• Adding a wildcard symbol may retrieve word variants: (((("research write paper") or ((("research past paper") OR ("research post paper"))))) or ("research white paper"))*.