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