Perhaps you should try some spelling variations:
"Policy research workshop paper" » "Policy research workshop papers", "Policy research workshop panel", "Policy research workshop cape"
"Policy research workshop papm" » "Policy research workshop para", "Policy research workshop part", "Policy research workshop pacs"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Policy research workshop paper\") OR (\"Policy research workshop papm\"))*".
• Removing quotes may allow a broader search: (( Policy research workshop paper ) OR ( Policy research workshop papm ))*.