Perhaps you should try some spelling variations:
"world economic department working papers" » "world economics department working papers", "world economic debasement working papers", "world economic experiment working papers", "world economic departments working papers", "world economic department boarding papers", "world economic department nursing papers"
"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 nursing papers", "lead academic department working papers", "second academic department working papers", "world academic department 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", "world academic department working paper"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("world economic department working papers") OR ((("oecd academic department working papers") OR ("oecd academic department working paper")))).
• Removing quotes may allow a broader search: (( world economic department working papers ) or ((( oecd academic department working papers ) or ( oecd academic department working paper )))).
• Adding a wildcard symbol may retrieve word variants: (("world economic department working papers") or ((("oecd academic department working papers") or ("oecd academic department working paper"))))*.