Perhaps you should try some spelling variations:
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"oecd economic department working papers" » "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic displacement working papers", "oecd economic departments working papers", "oecd economic department boarding papers", "oecd economic department work papers", "oecd economic department working paper", "world economic department working papers"
"oecd academic department nursing papers" » "oecd academic departments nursing papers", "oecd academic patent nursing papers", "oecd academic development nursing papers", "oecd academic department guessing papers", "oecd academic departments using papers", "oecd academic department boarding papers", "oecd academic department using papers", "oecd academic department nursing fathers", "oecd academic department nursing experts", "lead academic department nursing papers", "second academic department nursing papers", "world academic department nursing papers"
"oecd economic treatment working papers" » "oecd taxonomic treatment working papers", "oecd economic investment working papers", "oecd oncologic treatment working papers", "oecd economic treatment forming papers", "oecd economic treatment looking papers", "oecd economic treatment during papers", "oecd economic treatment working paper", "world economic treatment 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 economic treatment working papers"))) OR ("oecd academic department nursing papers"))) OR ("oecd economics department working papers")).
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• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") OR ("oecd economic treatment working papers"))) or ("oecd academic department nursing papers"))) or ("oecd economics department working papers"))*.