Perhaps you should try some spelling variations:
"donauschwabischen schrifttum heft 9" » "donauschwabisches schrifttum heft 9" (Expand Search), "dopnauschwabisches schrifttum heft 9" (Expand Search), "donauschwabisches christentum heft 9" (Expand Search), "donauschwabischen schrifttum heft 3" (Expand Search), "donauschwabischen schrifttum heft 1" (Expand Search), "donauschwabischen schrifttum heft 4" (Expand Search)
"donauschwabischen schrifttum heft 2" » "donauschwabisches schrifttum heft 2" (Expand Search), "dopnauschwabisches schrifttum heft 2" (Expand Search), "donauschwabisches christentum heft 2" (Expand Search), "donauschwabischen schrifttum heft 3" (Expand Search), "donauschwabischen schrifttum heft 1" (Expand Search)

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• Adding a wildcard symbol may retrieve word variants: (("donauschwabischen schrifttum heft 9") OR ("donauschwabischen schrifttum heft 2"))*.