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 agreement working papers", "oecd economic appointments working papers"
"oecd economic debasement working papers" » "oecd economic measurement working papers", "oecd economic management working papers", "oecd economic engagement working papers", "oecd economic statement working papers", "oecd economic deployment working papers"
"oecd economic department working paper" » "oecd academic department working paper", "oecd economic experiment working paper", "oecd economic treatment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing 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: (((("oecd economic debasement working papers") OR ("oecd economic appeasement working papers"))) OR ((("oecd economic department working paper") OR ("oecd economics department working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic debasement working papers\") OR (\"oecd economic appeasement working papers\"))) or (((\"oecd economic department working paper\") or (\"oecd economics department working paper\"))))".
• Removing quotes may allow a broader search: (((( oecd economic debasement working papers ) OR ( oecd economic appeasement working papers ))) or ((( oecd economic department working paper ) or ( oecd economics department working paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic debasement working papers") OR ("oecd economic appeasement working papers"))) or ((("oecd economic department working paper") or ("oecd economics department working paper"))))*.