Perhaps you should try some spelling variations:
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"oecd academic department working paper" » "oecd academic departments working paper", "oecd academic development working paper", "oecd academic department boarding paper", "oecd academic department nursing paper", "lead academic department working paper", "second academic department working paper", "world academic department working paper", "oecd academic department working papers"
"oecd academic patent working paper" » "oecd academic talent working paper", "oecd academic content working paper", "oecd academic papers working paper", "oecd academic patients working paper", "oecd academic paint working paper", "oecd academic intent working paper", "lead academic patent working paper", "second academic patent working paper", "world academic patent working paper", "oecd academic patent working papers"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd academic department working paper") OR ("oecd academic patent working paper"))) OR ("oecd economics department working paper"))*.
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• Removing quotes may allow a broader search: (((( oecd academic department working paper ) OR ( oecd academic patent working paper ))) or ( oecd economics department working paper ))*.