Perhaps you should try some spelling variations:
"karl dietrich buchner" » "karl dietrich buchecker", "karl dietrich borner", "karl dietrich bracher", "karl friedrich buchner"
"karl dietrich benner" » "karl dietrich borner", "karl dieterich werner", "karl dietrich bernard", "karl friedrich benner"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"karl dietrich buchner\") OR (\"karl dietrich benner\"))".
• Removing quotes may allow a broader search: (( karl dietrich buchner ) OR ( karl dietrich benner )).
• Adding a wildcard symbol may retrieve word variants: (("karl dietrich buchner") OR ("karl dietrich benner"))*.