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