Perhaps you should try some spelling variations:
"world workshop discussion papers" » "world workshop discussions papers", "world workshop discussion paper", "world workshop discussion part", "world workshop discussion panel", "3rd workshop discussion papers", "oecd workshop discussion papers", "world works discussion papers"
"world worlds discussion papers" » "world world discussion papers", "world words discussion papers", "world welds discussion papers", "world worlds discussion paper", "world worlds discussion part", "world worlds discussion panel", "world world's discussion papers", "world worlded discussion papers"
"world workshop session papers" » "world workshop series papers", "3rd workshop session papers", "oecd workshop session papers", "world works session papers"

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