Perhaps you should try some spelling variations:
"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"
"world economic debasement working papers" » "world economic measurement working papers", "world economic appeasement working papers", "world economic management working papers", "world economic statement working papers", "world economic deployment working papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd academic department working paper", "oecd economic experiment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic debasement working papers") OR ("world economic debasement working papers"))) OR ("oecd economic department working paper")).
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