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

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