Perhaps you should try some spelling variations:
"research while paper" » "research where paper", "research what paper", "research why paper", "research white paper", "research while pair", "research while chapter"
"research which popes" » "research what popes", "research why popes", "research where popes", "research which popery", "research which pose", "research which possess"
"research ethics paper" » "research metrics paper", "research ethics apel", "research ethics peter"

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 while paper") OR ((("research ethics paper") OR ("research which popes")))).
• Removing quotes may allow a broader search: (( research while paper ) or ((( research ethics paper ) or ( research which popes )))).
• Adding a wildcard symbol may retrieve word variants: (("research while paper") or ((("research ethics paper") or ("research which popes"))))*.