Perhaps you should try some spelling variations:
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic treatment working papers", "oecd economic displacement working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "world economic department working papers"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic treatment working paper", "oecd economic displacement working paper", "oecd economic departments working paper", "oecd economic department boarding paper", "oecd economic department nursing paper", "world economic department working paper"
"oecd economic experiment working papers" » "oecd economic experiments working papers", "oecd economics experiments working papers", "oecd economic empowerment working papers", "oecd economic experimental working papers", "oecd economic experiment wirkung papers", "world economic experiment working papers"
"oecd economic debasement working papers" » "oecd economic measurement working papers", "oecd economic appeasement working papers", "oecd economic management working papers", "oecd economic statement working papers", "oecd economic deployment working papers", "world economic debasement 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 papers") OR ("oecd economic experiment working papers"))) OR ("oecd economic debasement working papers"))) OR ("lead academic department 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 economic experiment working papers\"))) or (\"oecd economic debasement working papers\"))) or (\"lead academic department working papers\"))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((((((( oecd economic department working papers ) OR ( oecd economic experiment working papers ))) or ( oecd economic debasement working papers ))) or ( lead academic department working papers ))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((((("oecd economic department working papers") OR ("oecd economic experiment working papers"))) or ("oecd economic debasement working papers"))) or ("lead academic department working papers"))) or ("oecd economic department working paper"))*.