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