Perhaps you should try some spelling variations:
"donauschwabisches christentum eine 1" » "donauschwabisches schrifttum eine 1" (Expand Search), "dopnauschwabisches schrifttum eine 1" (Expand Search), "donauschwabisches christbaum eine 1" (Expand Search), "donauschwabisches christentum der 1" (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: (("donauschwabischen schrifttum heft 10") OR ("donauschwabisches christentum eine 1"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabischen schrifttum heft 10\") OR (\"donauschwabisches christentum eine 1\"))".
• Removing quotes may allow a broader search: (( donauschwabischen schrifttum heft 10 ) OR ( donauschwabisches christentum eine 1 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabischen schrifttum heft 10") OR ("donauschwabisches christentum eine 1"))*.