Perhaps you should try some spelling variations:
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "oecd economic department work papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic department boarding paper", "oecd economic department nursing paper", "oecd economic department work paper"
"oecd academic department working papers" » "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department boarding papers", "oecd academic department nursing papers", "oecd academic department work papers", "lead academic department working papers", "second academic department working papers", "world academic department working papers"
"oecd academic departments working papers" » "oecd academic patents working papers", "oecd academic developments working papers", "oecd academic departments wrong papers", "oecd academic department nursing papers", "oecd academic department work papers", "lead academic departments working papers", "second academic departments working papers", "world academic departments working papers"

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 department working papers") OR ((("oecd academic department working papers") OR ("oecd academic departments working papers"))))) OR ("oecd economic department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department working papers\") or (((\"oecd academic department working papers\") OR (\"oecd academic departments working papers\"))))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ((( oecd academic department working papers ) OR ( oecd academic departments working papers ))))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ((("oecd academic department working papers") OR ("oecd academic departments working papers"))))) or ("oecd economic department working paper"))*.