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 papers" » "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic treatment working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department nursing 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 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 patent working papers" » "oecd academic content working papers", "oecd academic papers working papers", "oecd academic paper working papers", "oecd academic patients working papers", "oecd academic paint working papers", "oecd academic intent working papers", "lead academic patent working papers", "second academic patent working papers", "world academic patent 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 economics department working papers"))) OR ((("oecd academic department working papers") OR ("oecd academic patent 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 economics department working papers\"))) or (((\"oecd academic department working papers\") OR (\"oecd academic patent working papers\"))))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economic department working papers ) or ( oecd economics department working papers ))) or ((( oecd academic department working papers ) OR ( oecd academic patent working papers ))))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") or ("oecd economics department working papers"))) or ((("oecd academic department working papers") OR ("oecd academic patent working papers"))))) or ("oecd economic department working paper"))*.