Perhaps you should try some spelling variations:
"abhandlungen zur nationalokonomie" » "abhandlungen und nationalokonomie", "abhandlungen die nationalokonomie", "abhandlungen aus nationalokonomie", "abhandlungen uber nationalokonomie"
"abhandlungen fur nationalokonomie" » "abhandlungen aus nationalokonomie", "abhandlungen zum nationalokonomie", "abhandlung fur nationalokonomie"
"abhandlungen der nationalokonomie" » "abhandlungen uber nationalokonomie", "verhandlungen der nationalokonomie", "wandlungen der nationalokonomie"

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: (((("abhandlungen fur nationalokonomie") OR ("abhandlungen der nationalokonomie"))) OR ("abhandlungen zur nationalokonomie")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"abhandlungen fur nationalokonomie\") OR (\"abhandlungen der nationalokonomie\"))) or (\"abhandlungen zur nationalokonomie\"))".
• Removing quotes may allow a broader search: (((( abhandlungen fur nationalokonomie ) OR ( abhandlungen der nationalokonomie ))) or ( abhandlungen zur nationalokonomie )).
• Adding a wildcard symbol may retrieve word variants: (((("abhandlungen fur nationalokonomie") OR ("abhandlungen der nationalokonomie"))) or ("abhandlungen zur nationalokonomie"))*.