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 nursing papers", "oecd economics department work papers", "oecd economics department working paper", "oecd economies department working papers", "kcd economics department working papers", "world economics department working papers"
"oecd economic department working papers" » "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic treatment working papers", "oecd economic departments working papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"oecd economic department boarding papers" » "oecd economic debasement boarding papers", "oecd economic experiment boarding papers", "oecd economic treatment boarding papers", "oecd economic department building papers", "oecd economic department boards papers", "oecd economic department providing papers", "oecd economic department boarding pass", "oecd economic department boarding passes", "oecd economic department marking papers"
"oecd academic department working papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department nursing papers", "oecd academic department work papers", "oecd academic department working paper", "lead academic department working papers", "second academic department working papers", "world 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 papers") OR ("oecd economic department boarding papers"))) OR ("oecd 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 papers\") OR (\"oecd economic department boarding papers\"))) or (\"oecd academic department working papers\"))) or (\"oecd economics department working papers\"))".
• Removing quotes may allow a broader search: (((((( oecd economic department working papers ) OR ( oecd economic department boarding papers ))) or ( oecd academic department working papers ))) or ( oecd economics department working papers )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") OR ("oecd economic department boarding papers"))) or ("oecd academic department working papers"))) or ("oecd economics department working papers"))*.