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