Perhaps you should try some spelling variations:
research written » research write, research within, research writing
written paper » written after, writing paper
research work » research working, research network, research what
work papers » works papers, work paper, york 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 written paper ) OR ( research work papers )).
• Adding a wildcard symbol may retrieve word variants: (( research written paper ) or ( research work papers ))*.