Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum uber. 23" » "donauschwabisches schrifttum uber. 23" (Expand Search), "donauschwabisches christentum uber. 23" (Expand Search), "dopnauschwabisches schrifttums der. 23" (Expand Search)
"donauschwabischen schrifttum nr. 23" » "donauschwabisches schrifttum nr. 23" (Expand Search), "donauschwabisches christentum nr. 23" (Expand Search), "donauschwabischen geschichte nr. 23" (Expand Search), "donauschwabischen schrifttum der. 23" (Expand Search), "donauschwabischen schrifttum und. 23" (Expand Search), "donauschwabischen schrifttum _. 23" (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 schrifttum nr. 23") OR ("dopnauschwabisches schrifttum uber. 23"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabischen schrifttum nr. 23\") OR (\"dopnauschwabisches schrifttum uber. 23\"))*".
• Removing quotes may allow a broader search: (( donauschwabischen schrifttum nr. 23 ) OR ( dopnauschwabisches schrifttum uber. 23 ))*.