Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum heft 1" » "donauschwabisches christentum heft 1" (Expand Search), "dopnauschwabisches schrifttum heft 3" (Expand Search)
"donauschwabisches schrifttum heft 10" » "donauschwabisches schrifttum heft 12" (Expand Search), "donauschwabisches schrifttum heft 19" (Expand Search), "donauschwabisches schrifttum heft 30" (Expand Search), "donauschwabische schrifttum heft 10" (Expand Search), "donauschwabischen schrifttum heft 10" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabisches schrifttum heft 10\") OR (\"dopnauschwabisches schrifttum heft 1\"))~".
• Removing quotes may allow a broader search: (( donauschwabisches schrifttum heft 10 ) OR ( dopnauschwabisches schrifttum heft 1 ))~.
• Adding a wildcard symbol may retrieve word variants: (("donauschwabisches schrifttum heft 10") OR ("dopnauschwabisches schrifttum heft 1"))*.