Perhaps you should try some spelling variations:
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"oecd economic department working papers" » "oecd economics department working papers", "oecd academic department 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 working paper"
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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 providing papers") OR ("oecd economic debasement providing papers"))) OR ((("oecd economic department working papers") OR ("oecd economic department nursing papers")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oecd economic department providing papers\") OR (\"oecd economic debasement providing papers\"))) or (((\"oecd economic department working papers\") or (\"oecd economic department nursing papers\"))))".
• Removing quotes may allow a broader search: (((( oecd economic department providing papers ) OR ( oecd economic debasement providing papers ))) or ((( oecd economic department working papers ) or ( oecd economic department nursing papers )))).
• Adding a wildcard symbol may retrieve word variants: (((("oecd economic department providing papers") OR ("oecd economic debasement providing papers"))) or ((("oecd economic department working papers") or ("oecd economic department nursing papers"))))*.