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 des. 23" » "donauschwabischen geschichte der. 23" (Expand Search), "donauschwabischen geschichte und. 23" (Expand Search), "donauschwabischen geschichte einer. 23" (Expand Search), "donauschwabische geschichte des. 23" (Expand Search), "donauschwaben geschichte des. 23" (Expand Search)

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