Perhaps you should try some spelling variations:
"oecd economic experimental working paper" » "oecd economics experimental working paper", "oecd economic experiments working paper", "oecd economic experiment working paper", "oecd economic experimental sorting paper"
"oecd economic debasement working papers" » "oecd economic measurement working papers", "oecd economic appeasement working papers", "oecd economic engagement working papers", "oecd economic statement working papers", "oecd economic deployment working papers", "oecd economic descent working papers"
"oecd economic department working papers" » "oecd economics department working papers", "oecd academic department working papers", "oecd economic experiment working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department nursing papers"
"oecd economic management working papers" » "oecd economics management working papers", "oecd macroeconomic management working papers", "oecd dynamic management working papers", "oecd economic management work papers", "oecd economic management workshops 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 debasement working papers") OR ("oecd economic department working papers"))) OR ("oecd economic management working papers"))) OR ("oecd economic experimental working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economic debasement working papers\") OR (\"oecd economic department working papers\"))) or (\"oecd economic management working papers\"))) or (\"oecd economic experimental working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economic debasement working papers ) OR ( oecd economic department working papers ))) or ( oecd economic management working papers ))) or ( oecd economic experimental working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic debasement working papers") OR ("oecd economic department working papers"))) or ("oecd economic management working papers"))) or ("oecd economic experimental working paper"))*.