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

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