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)
"donauschwabische schrifttum und. 23" » "donauschwabisches schrifttum und. 23" (Expand Search), "donauschwabisches christentum und. 23" (Expand Search), "donauschwabische schrifttum uber. 23" (Expand Search), "donauschwabische schrifttum der. 23" (Expand Search)

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