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