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