Perhaps you should try some spelling variations:
"oecd economic developments working papers" » "oecd economic development working papers", "oecd economic developments sorting papers", "oecd economic development looking papers", "oecd economic developments during papers", "oecd economic developments working paper"
"oecd economics development working papers" » "oecd economic development working papers", "oecd economics development work 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 department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department nursing papers", "oecd economic 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", "oecd academic department working paper", "lead academic department working papers", "second academic department working papers", "world 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 academic department working papers"))) OR ((("oecd economics development working papers") OR ("oecd economic developments working papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department working papers\") or (\"oecd academic department working papers\"))) or (((\"oecd economics development working papers\") OR (\"oecd economic developments working papers\"))))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ( oecd academic department working papers ))) or ((( oecd economics development working papers ) OR ( oecd economic developments working papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ("oecd academic department working papers"))) or ((("oecd economics development working papers") OR ("oecd economic developments working papers"))))*.