Perhaps you should try some spelling variations:
"dopnauschwabisches schrifttum der. 23" » "donauschwabisches schrifttum der. 23" (Expand Search), "dopnauschwabisches schrifttums der. 23" (Expand Search), "dopnauschwabisches schrifttum uber. 23" (Expand Search), "dopnauschwabisches schrifttum heft. 23" (Expand Search)
"donauschwabisches christentum der. 23" » "donauschwabisches schrifttum der. 23" (Expand Search), "donauschwabisches christentum eine. 23" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"dopnauschwabisches schrifttum der. 23\") OR (\"donauschwabisches christentum der. 23\"))~".
• Removing quotes may allow a broader search: (( dopnauschwabisches schrifttum der. 23 ) OR ( donauschwabisches christentum der. 23 ))~.
• Adding a wildcard symbol may retrieve word variants: (("dopnauschwabisches schrifttum der. 23") OR ("donauschwabisches christentum der. 23"))*.