Perhaps you should try some spelling variations:
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics departments working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economic department working papers" » "oecd economic experiment working papers", "oecd economic treatment working papers", "oecd economic displacement working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department nursing 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 papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department boarding papers", "oecd academic department nursing papers", "lead academic department working papers", "second academic department working papers", "world academic department working papers"
"oecd economic debasement working paper" » "oecd economic measurement working paper", "oecd economic appeasement working paper", "oecd economic management working paper", "oecd economic statement working paper", "oecd economic deployment working paper"

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