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