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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabisches christentum der 19") OR ("donauschwabischen schrifttum heft 10"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabisches christentum der 19\") OR (\"donauschwabischen schrifttum heft 10\"))".
• Removing quotes may allow a broader search: (( donauschwabisches christentum der 19 ) OR ( donauschwabischen schrifttum heft 10 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabisches christentum der 19") OR ("donauschwabischen schrifttum heft 10"))*.