Perhaps you should try some spelling variations:
"donauschwabischen schrifttum heft 12" » "dopnauschwabisches schrifttum heft 12" (Expand Search), "donauschwabisches christentum heft 12" (Expand Search), "donauschwabischen geschichte heft 12" (Expand Search), "donauschwabischen schrifttum heft 2" (Expand Search), "donauschwabischen schrifttum heft 10" (Expand Search), "donauschwabischen schrifttum heft 19" (Expand Search), "donauschwabischen schrifttum heft 32" (Expand Search)
"donauschwabisches schrifttum heft 1" » "donauschwabisches schrifttum heft 3" (Expand Search), "donauschwabische schrifttum heft 1" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabisches schrifttum heft 1") OR ("donauschwabischen schrifttum heft 12"))~.
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• Adding a wildcard symbol may retrieve word variants: (("donauschwabisches schrifttum heft 1") OR ("donauschwabischen schrifttum heft 12"))*.