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 debasement working papers" » "oecd economic measurement working papers", "oecd economic appeasement working papers", "oecd economic management working papers", "oecd economic statement working papers", "oecd economic deployment working papers"
"oecd economic department working paper" » "oecd economic experiment working paper", "oecd economic treatment working paper", "oecd economic displacement working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"
"oecd academic department working paper" » "oecd academic departments working paper", "oecd academic patent working paper", "oecd academic development working paper", "oecd academic department boarding paper", "oecd academic department nursing paper", "lead academic department working paper", "second academic department working paper", "world academic department working 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 department working paper") OR ("oecd academic 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 department working paper\") OR (\"oecd academic department working paper\"))) or (\"oecd economics department working paper\"))))".
• Removing quotes may allow a broader search: (( oecd economic debasement working papers ) or ((((( oecd economic department working paper ) OR ( oecd academic 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 department working paper") OR ("oecd academic department working paper"))) or ("oecd economics department working paper"))))*.