Perhaps you should try some spelling variations:
"world workshop discussion papers" » "world workshop discussions papers", "world workshop session papers", "world workshop discussion part", "3rd workshop discussion papers", "oecd workshop discussion papers", "world works discussion papers", "world worksshop discussion papers", "worlds workshop discussion papers", "worldly workshop discussion papers"
"world work discussion papers" » "world work discussion part", "world networks discussion papers", "world workshop discussions papers", "world works discussion papers", "worlds work discussion papers", "worldly work discussion papers"
"world word discussion papers" » "world word discussion part", "world words discussion papers", "world cord discussion papers", "world ord discussion papers", "world works discussion papers", "world worth discussion papers", "world would discussion papers"
"world world discussion papers" » "world world discussion part", "world board discussion papers", "world based discussion papers", "world d discussion papers", "old world discussion papers", "world works discussion papers"
"world world discussion panel" » "world board discussion panel", "world based discussion panel", "world d discussion panel", "world world discussion part", "old world discussion panel", "world works discussion panel"
"world work discussion paper" » "world networks discussion paper", "world workshop discussions paper", "world works discussion paper", "worlds work discussion paper", "worldly work discussion paper"

Try widening your search to All Fields.

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