Perhaps you should try some spelling variations:
"nationale region stadt" » "nationale din stadt" (Expand Search), "nationalae region stadt" (Expand Search), "nationalene region stadt" (Expand Search), "nationalese region stadt" (Expand Search)
"national regional state" » "nationala regional state" (Expand Search), "nationalen regional state" (Expand Search), "nationales regional state" (Expand Search)
"nationaler region stadt" » "nationalaer region stadt" (Expand Search), "nationalener region stadt" (Expand Search), "nationaleser region stadt" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("national regional state") OR ((("nationale region stadt") OR ("nationaler region stadt"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"national regional state\") OR (((\"nationale region stadt\") OR (\"nationaler region stadt\"))))*".
• Removing quotes may allow a broader search: (( national regional state ) OR ((( nationale region stadt ) OR ( nationaler region stadt ))))*.