Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum heft 19" » "donauschwabisches schrifttum heft 19" (Expand Search), "donauschwabisches christentum heft 19" (Expand Search), "dopnauschwabisches schrifttum heft 1" (Expand Search), "dopnauschwabisches schrifttum heft 9" (Expand Search), "dopnauschwabisches schrifttum heft 12" (Expand Search)
"donauschwabische schrifttum heft 10" » "donauschwabisches schrifttum heft 10" (Expand Search), "donauschwabisches christentum heft 10" (Expand Search), "donauschwabische schrifttum heft 1" (Expand Search), "donauschwabische schrifttum heft 12" (Expand Search)

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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