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"))))*.