Perhaps you should try some spelling variations:
"abhandlungen aus nationalokonomie" » "abhandlungen auf nationalokonomie", "abhandlungen fur nationalokonomie", "abhandlungen zur nationalokonomie", "abhandlungen uber nationalokonomie"
"abhandlungen der nationalokonomie" » "abhandlungen uber nationalokonomie", "abhandlungen zur nationalokonomie", "verhandlungen der nationalokonomie"

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 aus nationalokonomie") OR ("abhandlungen der nationalokonomie")).
• Removing quotes may allow a broader search: (( abhandlungen aus nationalokonomie ) or ( abhandlungen der nationalokonomie )).
• Adding a wildcard symbol may retrieve word variants: (("abhandlungen aus nationalokonomie") or ("abhandlungen der nationalokonomie"))*.