Perhaps you should try some spelling variations:
"oecd workshop discussion papers" » "oecd workshop discussions papers", "oecd workshop session 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 workers discussion papers" » "world blockers discussion papers", "world work discussion papers", "world markets discussion papers", "world workers discussion paper", "world workers discussion part", "world workers discussion panel", "world's workers discussion papers", "work workers discussion papers", "old workers 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 world discussion papers", "world networks discussion papers", "world working discussion papers"
"world wars discussion papers" » "world wars discussion paper", "world wars discussion part", "world wars discussion panel", "world mars discussion papers", "world war discussion papers", "world dwarfs discussion papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("world works discussion papers") OR ("world wars discussion papers"))) OR ("world workers discussion papers"))) OR ("oecd workshop discussion papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"world works discussion papers\") OR (\"world wars discussion papers\"))) or (\"world workers discussion papers\"))) or (\"oecd workshop discussion papers\"))".
• Removing quotes may allow a broader search: (((((( world works discussion papers ) OR ( world wars discussion papers ))) or ( world workers discussion papers ))) or ( oecd workshop discussion papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("world works discussion papers") OR ("world wars discussion papers"))) or ("world workers discussion papers"))) or ("oecd workshop discussion papers"))*.