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 paris"
"Policy research workshop para" » "Policy research workshop paris", "Policy research workshop papers", "Policy research workshop program"

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