Perhaps you should try some spelling variations:
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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: (((("kcd economics department nursing papers") OR ("food economics department nursing papers"))) OR ("oecd economies department work papers")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"kcd economics department nursing papers\") OR (\"food economics department nursing papers\"))) or (\"oecd economies department work papers\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("kcd economics department nursing papers") OR ("food economics department nursing papers"))) or ("oecd economies department work papers"))*.