Perhaps you should try some spelling variations:
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"oecd economic department nursing papers" » "oecd economics department nursing papers", "oecd economic debasement nursing papers", "oecd economic experiment nursing papers", "oecd economic department guessing papers", "oecd economic departments using papers", "oecd economic department boarding papers", "oecd economic department using papers", "oecd economic department nursing fathers", "oecd economic department nursing experts", "world economic department nursing papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department work paper", "world economic department working 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 work papers", "lead academic department working papers", "second academic department working papers", "world academic department 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 nursing papers"))) OR ("oecd academic department working papers"))) OR ("oecd economic department working paper")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") OR ("oecd economic department nursing papers"))) or ("oecd academic department working papers"))) or ("oecd economic department working paper"))*.