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

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: (("donauschwabischen schrifttum heft 10") OR ("dopnauschwabisches schrifttum heft 3"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabischen schrifttum heft 10\") OR (\"dopnauschwabisches schrifttum heft 3\"))".
• Removing quotes may allow a broader search: (( donauschwabischen schrifttum heft 10 ) OR ( dopnauschwabisches schrifttum heft 3 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabischen schrifttum heft 10") OR ("dopnauschwabisches schrifttum heft 3"))*.