Perhaps you should try some spelling variations:
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"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 work paper"
"oecd economic department nursing paper" » "oecd economics department nursing paper", "oecd academic department nursing paper", "oecd economic experiment nursing paper", "oecd economic department guessing paper", "oecd economic departments using paper", "oecd economic department building paper", "oecd economic department nursing chapter", "oecd economic department nursing career", "oecd economic department nursing cancer"

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 economic department nursing paper")))).
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