Perhaps you should try some spelling variations:
"oecd economics department working papers" » "oecd economics development working papers", "oecd economics experiments working papers", "oecd economics management working papers", "oecd economics departments working papers", "oecd economics department boarding papers", "oecd economics department nursing papers", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economic department working paper" » "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic treatment working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"
"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", "second academic department working papers", "world academic department working papers", "board academic department working papers"
"lead academic department working papers" » "lead academic departments working papers", "lead academic patent working papers", "lead academic development working papers", "lead academic department boarding papers", "lead academic department nursing papers", "learn academic department working papers", "leave academic department working papers", "bad academic department 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 paper") OR ((("oecd academic department working papers") OR ("lead academic department working papers"))))) OR ("oecd economics department working papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department working paper\") or (((\"oecd academic department working papers\") OR (\"lead academic department working papers\"))))) or (\"oecd economics department working papers\"))".
• Removing quotes may allow a broader search: (((( oecd economic department working paper ) or ((( oecd academic department working papers ) OR ( lead academic department working papers ))))) or ( oecd economics department working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working paper") or ((("oecd academic department working papers") OR ("lead academic department working papers"))))) or ("oecd economics department working papers"))*.