Perhaps you should try some spelling variations:
"oecd economies development working papers" » "oecd economics development working papers", "oecd economics developments working papers", "oecd economic development working papers", "oecd economies development work papers", "oecd economies development workflow papers", "oecd economies development within papers", "oecd economies development working paper"
"oecd academic development working papers" » "oecd economic development working papers", "oecd economic developments working papers", "oecd strategic development working papers", "oecd academic development work papers", "oecd academic development workflow papers", "oecd academic development within papers", "oecd academic development working paper", "lead academic development working papers", "second academic development working papers", "world academic 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 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 academic development working papers"))))) OR ("oecd economies development 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 academic development working papers\"))))) or (\"oecd economies development working papers\"))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ((( oecd academic department working papers ) OR ( oecd academic development working papers ))))) or ( oecd economies development working papers )).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ((("oecd academic department working papers") OR ("oecd academic development working papers"))))) or ("oecd economies development working papers"))*.