Perhaps you should try some spelling variations:
"donauschwabisches christentum heft 9" » "donauschwabisches schrifttum heft 9" (Expand Search), "dopnauschwabisches schrifttum heft 9" (Expand Search), "donauschwabisches christentum der 9" (Expand Search), "donauschwabisches christentum eine 9" (Expand Search), "donauschwabisches christentum heft 3" (Expand Search), "donauschwabisches christentum heft 1" (Expand Search), "donauschwabisches christentum heft 2" (Expand Search)
"donauschwabische schrifttum heft 12" » "donauschwabisches schrifttum heft 12" (Expand Search), "dopnauschwabisches schrifttum heft 12" (Expand Search), "donauschwabische schrifttum heft 1" (Expand Search), "donauschwabische schrifttum heft 2" (Expand Search), "donauschwabische schrifttum heft 10" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabisches christentum heft 9") OR ("donauschwabische schrifttum heft 12"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabisches christentum heft 9\") OR (\"donauschwabische schrifttum heft 12\"))".
• Removing quotes may allow a broader search: (( donauschwabisches christentum heft 9 ) OR ( donauschwabische schrifttum heft 12 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabisches christentum heft 9") OR ("donauschwabische schrifttum heft 12"))*.