Perhaps you should try some spelling variations:
"oecd economics department working paper" » "oecd economics development working paper", "oecd economics experiments working paper", "oecd economics management working paper", "oecd economics departments working paper", "oecd economics department boarding paper", "oecd economics department nursing paper", "oecd economies department working paper", "kcd economics department working paper", "world economics department working 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", "lead academic department working papers", "second academic department working papers", "world academic department working papers"
"oecd economic department working papers" » "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic displacement 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 displacement working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper"
"oecd economic treatment working papers" » "oecd taxonomic treatment working papers", "oecd economic investment working papers", "oecd dynamic treatment working papers", "oecd economic treatment forming papers", "oecd economic treatment looking papers", "oecd economic treatment during papers"

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