Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum nr. 23" » "donauschwabisches schrifttum nr. 23" (Expand Search), "donauschwabisches christentum nr. 23" (Expand Search), "dopnauschwabisches schrifttum der. 23" (Expand Search), "dopnauschwabisches schrifttum und. 23" (Expand Search), "dopnauschwabisches schrifttum _. 23" (Expand Search)
"donauschwabische geschichte uber. 23" » "donauschwabischen geschichte uber. 23" (Expand Search), "donauschwabische geschichte der. 23" (Expand Search), "donauschwabische geschichte einer. 23" (Expand Search), "donauschwabische geschichte ihrer. 23" (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: (("donauschwabische geschichte uber. 23") OR ("dopnauschwabisches schrifttum nr. 23"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabische geschichte uber. 23\") OR (\"dopnauschwabisches schrifttum nr. 23\"))".
• Removing quotes may allow a broader search: (( donauschwabische geschichte uber. 23 ) OR ( dopnauschwabisches schrifttum nr. 23 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabische geschichte uber. 23") OR ("dopnauschwabisches schrifttum nr. 23"))*.