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