Perhaps you should try some spelling variations:
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd academic department working papers", "oecd economic departments working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"oecd economic department boarding papers" » "oecd economics department boarding papers", "oecd economic debasement boarding papers", "oecd academic department boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department learning papers"
"oecd economics management working papers" » "oecd economics management work papers", "oecd economics management workshops papers", "oecd economics management working paper", "oecd economies management working papers", "kcd economics management working papers", "world economics management working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic department working papers") OR ("oecd economic department boarding papers"))) OR ("oecd economics management working papers")).
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• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") OR ("oecd economic department boarding papers"))) or ("oecd economics management working papers"))*.