Perhaps you should try some spelling variations:
research written » research write, research within, research writing
research white » research write, research what, research where
research while » research where, research which, research what
written paper » written after, writing paper
white papers » white paper, state papers, late papers
while papers » while others, while part, while pair

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 written paper ) OR ((( research white papers ) OR ( research while papers )))).
• Adding a wildcard symbol may retrieve word variants: (( research written paper ) or ((( research white papers ) or ( research while papers ))))*.