Perhaps you should try some spelling variations:
"oecd workshop discussion papers" » "oecd workshop discussions papers", "oecd workshop discussion paper", "oecd workshop discussion part", "oecd workshop discussion panel", "second workshop discussion papers", "2nd workshop discussion papers", "3rd workshop discussion papers"
"world works discussion papers" » "world works discussion paper", "world works discussion part", "world works discussion panel", "world work discussion papers", "world words discussion papers", "world workers discussion papers", "world wars discussion papers", "world world discussion papers", "world networks discussion papers"
"oecd workshop session papers" » "oecd workshop series papers", "second workshop session papers", "2nd workshop session papers", "3rd workshop 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 works discussion papers") OR ((("oecd workshop discussion papers") OR ("oecd workshop session papers")))).
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• Removing quotes may allow a broader search: (( world works discussion papers ) or ((( oecd workshop discussion papers ) OR ( oecd workshop session papers )))).
• Adding a wildcard symbol may retrieve word variants: (("world works discussion papers") or ((("oecd workshop discussion papers") OR ("oecd workshop session papers"))))*.