Perhaps you should try some spelling variations:
"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 nursing papers", "oecd economic department work papers"
"world economic department working paper" » "world economics department working paper", "world economic debasement working paper", "world economic experiment working paper", "world economic departments working paper", "world economic department nursing paper", "world economic department work paper"
"world economic department boarding paper" » "world economics department boarding paper", "world economic debasement boarding paper", "world economic experiment boarding paper", "world economic department building paper", "world economic department boards paper", "world economic department providing paper", "world economic department boarding passes", "world economic department boarding pass", "world economic department folding paper"
"oecd academic department working papers" » "oecd academic departments working papers", "oecd academic patent working papers", "oecd academic development working papers", "oecd academic department nursing papers", "oecd academic department work papers", "lead academic department working papers", "second academic department working papers", "world 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 ("oecd academic department working papers"))) OR ((("world economic department working paper") OR ("world economic department boarding paper")))).
• 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 (((\"world economic department working paper\") OR (\"world economic department boarding paper\"))))".
• Removing quotes may allow a broader search: (((( oecd economic department working papers ) or ( oecd academic department working papers ))) or ((( world economic department working paper ) OR ( world economic department boarding paper )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department working papers") or ("oecd academic department working papers"))) or ((("world economic department working paper") OR ("world economic department boarding paper"))))*.