Perhaps you should try some spelling variations:
sudostdeutsche volkes » sudostdeutsche volks (Expand Search), sudostdeutsche kuche (Expand Search)
die sudostdeutsche » des sudostdeutschen (Expand Search), der sudostdeutschen (Expand Search), des sudostdeutsches (Expand Search)
instituts die » instituts der (Expand Search), instituts fur (Expand Search), institut der (Expand Search)
volkes zur » volkes zu (Expand Search), volkes zum (Expand Search), volkern zur (Expand Search)

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: "instituts die sudostdeutsche volkes zur geschichte (sudosteuropas* OR sudosteuropa*)~".
• Adding a wildcard symbol may retrieve word variants: instituts die sudostdeutsche volkes zur geschichte (sudosteuropas* OR sudosteuropa*)*.