Perhaps you should try some spelling variations:
"oecd economics development working paper" » "oecd economic development working paper", "oecd economic developments working paper", "oecd economics development work paper", "oecd economics development workflow paper", "oecd economics development within paper", "oecd economies development working paper", "kcd economics development working paper", "oecd economics development working papers"
"oecd academic department working paper" » "oecd academic departments working paper", "oecd academic patent 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", "board academic department working paper", "oecd academic department working papers"
"world academic department working paper" » "world academic departments working paper", "world academic patent working paper", "world academic development working paper", "world academic department boarding paper", "world academic department nursing paper", "world academic department 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 ("world academic department working paper"))) OR ("oecd economics development working paper"))*.
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• Removing quotes may allow a broader search: (((( oecd academic department working paper ) OR ( world academic department working paper ))) or ( oecd economics development working paper ))*.