Perhaps you should try some spelling variations:
"Policy research workshop paper" » "Policy research workshop papers", "Policy research workshop papm", "Policy research workshop cape"
"Policy research workshop panel" » "Policy research workshops panels", "Policy research workshop papers", "Policy research workshop para"
"policy research working papers" » "policy research working paper"

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