Perhaps you should try some spelling variations:
research while » research where, research what, research why
research which » research ethics, research what, research why
which popery » which popes, which policy, which pose
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 while paper ) OR ( research which popery )).
• Adding a wildcard symbol may retrieve word variants: (( research while paper ) or ( research which popery ))*.