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