Perhaps you should try some spelling variations:
"policy research workshop papers" » "policy research workshop patmos", "policy research workshop panels", "policy research workshop papms", "policy research workshop capes"
"policy research workshop paper" » "policy research workshop panel", "policy research workshop papm", "policy research workshop cape"

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: (((("policy research workshop paper") OR ("policy research workshop papers"))) OR ("policy research working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"policy research workshop paper\") OR (\"policy research workshop papers\"))) or (\"policy research working paper\"))".
• Removing quotes may allow a broader search: (((( policy research workshop paper ) OR ( policy research workshop papers ))) or ( policy research working paper )).
• Adding a wildcard symbol may retrieve word variants: (((("policy research workshop paper") OR ("policy research workshop papers"))) or ("policy research working paper"))*.