Perhaps you should try some spelling variations:
"oecd economics development working papers" » "oecd economic development working papers", "oecd economic developments working papers", "oecd economics development work papers", "oecd economics development workflow papers", "oecd economics development within papers", "oecd economics development working paper", "oecd economies development working papers", "kcd economics development working papers", "world economics development working papers"
"oecd economic departments working papers" » "oecd economics department working papers", "oecd economic experiments working papers", "oecd academic departments working papers", "oecd economics departments working papers", "oecd economic departments wrong papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic departments working paper"
"oecd economic department working papers" » "oecd economics department working papers", "oecd academic department working papers", "oecd economic experiment working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "oecd economic department work papers", "oecd economic department working paper"
"world economic department working papers" » "world economics department working papers", "world academic department working papers", "world economic experiment working papers", "world economic department boarding papers", "world economic department nursing papers", "world economic department work papers", "world economic department working paper"
"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", "oecd economic debasement working paper"

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