Perhaps you should try some spelling variations:
"oecd economic departments working paper" » "oecd economics department working paper", "oecd economic experiments working paper", "oecd academic departments working paper", "oecd economics departments working paper", "oecd economic debasements working paper", "oecd economic departments wrong paper", "oecd economic department nursing paper", "oecd economic department work paper"
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement 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" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic department boarding paper", "oecd economic department nursing paper", "oecd economic department work paper"
"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", "lead academic department work papers", "learn academic department working papers", "leave academic department working papers", "bad academic department working papers"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oecd economic department working papers") OR ("lead academic department working papers"))) OR ((("oecd economic department working paper") OR ("oecd economic departments working paper")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department working papers\") or (\"lead academic department working papers\"))) or (((\"oecd economic department working paper\") OR (\"oecd economic departments working paper\"))))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ( lead academic department working papers ))) or ((( oecd economic department working paper ) OR ( oecd economic departments working paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ("lead academic department working papers"))) or ((("oecd economic department working paper") OR ("oecd economic departments working paper"))))*.