Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttums der. 23" » "dopnauschwabisches schrifttum der. 23" (Expand Search), "donauschwabisches schrifttum der. 23" (Expand Search), "donauschwabisches christentum der. 23" (Expand Search)
"donauschwabische schrifttum _. 23" » "donauschwabisches schrifttum _. 23" (Expand Search), "dopnauschwabisches schrifttum _. 23" (Expand Search), "donauschwabisches christentum _. 23" (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: "((\"donauschwabische schrifttum _. 23\") OR (\"dopnauschwabisches schrifttums der. 23\"))~".
• Removing quotes may allow a broader search: (( donauschwabische schrifttum _. 23 ) OR ( dopnauschwabisches schrifttums der. 23 ))~.
• Adding a wildcard symbol may retrieve word variants: (("donauschwabische schrifttum _. 23") OR ("dopnauschwabisches schrifttums der. 23"))*.