Perhaps you should try some spelling variations:
geschichte sudosteuropa » geschichte sudosteuropas (Expand Search)
sudostdeutsches volks » sudostdeutsche volks (Expand Search)
des sudostdeutsches » des sudostdeutschen (Expand Search), der sudostdeutschen (Expand Search)
instituts des » instituts der (Expand Search), institut der (Expand Search), instituts heft (Expand Search)
volks zur » volkes zum (Expand Search), volkes zu (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: instituts des sudostdeutsches volks zur geschichte sudosteuropa~.
• Adding a wildcard symbol may retrieve word variants: instituts des sudostdeutsches volks zur geschichte sudosteuropa*.