Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum heft 1" » "donauschwabisches schrifttum heft 1" (Expand Search), "donauschwabisches christentum heft 1" (Expand Search), "dopnauschwabisches schrifttum heft 3" (Expand Search)
"donauschwabischen geschichte heft 30" » "donauschwabischen geschichte der 30" (Expand Search), "donauschwabischen geschichte des 30" (Expand Search), "donauschwabischen geschichte auf 30" (Expand Search), "donauschwabischen geschichte heft 3" (Expand Search), "donauschwabischen geschichte heft 10" (Expand Search), "donauschwabische geschichte heft 30" (Expand Search), "donauschwaben geschichte heft 30" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabischen geschichte heft 30") OR ("dopnauschwabisches schrifttum heft 1"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabischen geschichte heft 30\") OR (\"dopnauschwabisches schrifttum heft 1\"))".
• Removing quotes may allow a broader search: (( donauschwabischen geschichte heft 30 ) OR ( dopnauschwabisches schrifttum heft 1 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabischen geschichte heft 30") OR ("dopnauschwabisches schrifttum heft 1"))*.