Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum uber. 23" » "donauschwabisches schrifttum uber. 23" (Expand Search), "donauschwabisches christentum uber. 23" (Expand Search), "dopnauschwabisches schrifttums der. 23" (Expand Search)
"donauschwabische schrifttum der. 23" » "donauschwabisches schrifttum der. 23" (Expand Search), "donauschwabisches christentum der. 23" (Expand Search), "donauschwabische schrifttums der. 23" (Expand Search), "donauschwabische schrifttum heft. 23" (Expand Search), "donauschwabische schrifttum und. 23" (Expand Search)

Try widening your search to All Fields.

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