Perhaps you should try some spelling variations:
"abhandlungen fur nationalokonomie" » "abhandlungen zur nationalokonomie", "abhandlungen aus nationalokonomie", "abhandlungen zum 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"abhandlungen fur nationalokonomie\") OR (\"abhandlungen der nationalokonomie\"))*".
• Removing quotes may allow a broader search: (( abhandlungen fur nationalokonomie ) OR ( abhandlungen der nationalokonomie ))*.