Perhaps you should try some spelling variations:
"donauschwabisches christentum nr. 23" » "donauschwabisches schrifttum nr. 23" (Expand Search), "dopnauschwabisches schrifttum nr. 23" (Expand Search), "donauschwabisches christentum der. 23" (Expand Search), "donauschwabisches christentum eine. 23" (Expand Search)
"donauschwabische geschichte nr. 23" » "donauschwabischen geschichte nr. 23" (Expand Search), "donauschwabische geschichte n. 23" (Expand Search), "donauschwabische geschichte der. 23" (Expand Search), "donauschwabische geschichte und. 23" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("donauschwabische geschichte nr. 23") OR ("donauschwabisches christentum nr. 23"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"donauschwabische geschichte nr. 23\") OR (\"donauschwabisches christentum nr. 23\"))".
• Removing quotes may allow a broader search: (( donauschwabische geschichte nr. 23 ) OR ( donauschwabisches christentum nr. 23 )).
• Adding a wildcard symbol may retrieve word variants: (("donauschwabische geschichte nr. 23") OR ("donauschwabisches christentum nr. 23"))*.