Perhaps you should try some spelling variations:
sudostdeuropaischen raumes » osteuropaischen raum (Expand Search), sudosteuropaischen volker (Expand Search)
des sudostdeuropaischen » der sudosteuropaischen (Expand Search), des sudostdeutschen (Expand Search)
der probleme » dem problem (Expand Search), fur probleme (Expand Search)
probleme des » problem des (Expand Search), problem der (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: sudosten-stimmen: schriftenreihe der probleme des sudostdeuropaischen raumes~.
• Adding a wildcard symbol may retrieve word variants: sudosten-stimmen: schriftenreihe der probleme des sudostdeuropaischen raumes*.