Perhaps you should try some spelling variations:
"hermann christian zach" » "herrmann christian zach" (Expand Search)
"johann christian zach" » "hans christian zach" (Expand Search), "von christian zach" (Expand Search), "doring christian zach" (Expand Search)
"johann christian nach" » "hans christian nach" (Expand Search), "von christian nach" (Expand Search), "doring christian nach" (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("johann christian zach") OR ("johann christian nach"))) OR ("hermann christian zach"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"johann christian zach\") OR (\"johann christian nach\"))) OR (\"hermann christian zach\"))*".
• Removing quotes may allow a broader search: (((( johann christian zach ) OR ( johann christian nach ))) OR ( hermann christian zach ))*.