Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum heft 2" » "donauschwabisches schrifttum heft 2" (Expand Search), "donauschwabisches christentum heft 2" (Expand Search), "dopnauschwabisches schrifttum heft 3" (Expand Search), "dopnauschwabisches schrifttum heft 1" (Expand Search)
"donauschwabische schrifttum heft 10" » "donauschwabisches schrifttum heft 10" (Expand Search), "donauschwabisches christentum heft 10" (Expand Search), "donauschwabische schrifttum heft 1" (Expand Search), "donauschwabische schrifttum heft 12" (Expand Search), "donauschwabische schrifttum heft 19" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dopnauschwabisches schrifttum heft 2") OR ("donauschwabische schrifttum heft 10"))~.
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• Adding a wildcard symbol may retrieve word variants: (("dopnauschwabisches schrifttum heft 2") OR ("donauschwabische schrifttum heft 10"))*.