Perhaps you should try some spelling variations:
research written » research write, research within, research writing
research while » research where, research which, research what
written paper » written after, writing paper
while paper » white paper, while pair, while chapter

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