Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum _. 23" » "donauschwabisches schrifttum _. 23" (Expand Search), "donauschwabisches christentum _. 23" (Expand Search)
"donauschwabischen schrifttum nr. 23" » "donauschwabisches schrifttum nr. 23" (Expand Search), "donauschwabisches christentum nr. 23" (Expand Search), "donauschwabischen geschichte nr. 23" (Expand Search), "donauschwabischen schrifttum der. 23" (Expand Search), "donauschwabischen schrifttum und. 23" (Expand Search), "donauschwabischen schrifttum im. 23" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabischen schrifttum nr. 23") OR ("dopnauschwabisches schrifttum _. 23"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabischen schrifttum nr. 23\") OR (\"dopnauschwabisches schrifttum _. 23\"))".
• Removing quotes may allow a broader search: (( donauschwabischen schrifttum nr. 23 ) OR ( dopnauschwabisches schrifttum _. 23 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabischen schrifttum nr. 23") OR ("dopnauschwabisches schrifttum _. 23"))*.