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

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