Perhaps you should try some spelling variations:
"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics departments working paper", "oecd economics department boarding paper", "oecd economics department nursing paper", "oecd economies department working paper", "kcd economics department working paper", "world economics department working paper"
"oecd economic appeasement working papers" » "oecd economic assessment working papers", "oecd economic emplacement working papers", "oecd economic placement working papers", "oecd economic appointments working papers"
"oecd economic engagement working papers" » "oecd economic management working papers", "oecd economics management working papers", "oecd academic engagement working papers", "oecd economic engagement during papers", "oecd economic engagement work papers"
"oecd economic debasement working paper" » "oecd economic measurement working paper", "oecd economic management working paper", "oecd economic placement working paper", "oecd economic statement working paper", "oecd economic deployment working paper"
"oecd economic agreement working papers" » "oecd economic agreements working papers", "oecd economy agreement working papers", "oecd economic argument working papers", "oecd economic agreement doing papers", "oecd economic agreement during papers", "oecd economic agreement pouring papers"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic engagement working papers") OR ((("oecd economic appeasement working papers") OR ("oecd economic agreement working papers"))))) OR ((("oecd economic debasement working paper") OR ("oecd economics department working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic engagement working papers\") or (((\"oecd economic appeasement working papers\") OR (\"oecd economic agreement working papers\"))))) or (((\"oecd economic debasement working paper\") or (\"oecd economics department working paper\"))))".
• Removing quotes may allow a broader search: (((( oecd economic engagement working papers ) or ((( oecd economic appeasement working papers ) OR ( oecd economic agreement working papers ))))) or ((( oecd economic debasement working paper ) or ( oecd economics department working paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic engagement working papers") or ((("oecd economic appeasement working papers") OR ("oecd economic agreement working papers"))))) or ((("oecd economic debasement working paper") or ("oecd economics department working paper"))))*.