Perhaps you should try some spelling variations:
"werner happel" » "werner hoppel", "werner hoppe", "werner chapter"
"werner nagel" » "werner daniel", "werner caskel", "werner jaeger"
"werner zager" » "werner jaeger", "werner baer", "werner jaegers"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("werner nagel") OR ("werner happel"))) OR ("werner zager")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"werner nagel\") OR (\"werner happel\"))) or (\"werner zager\"))".
• Removing quotes may allow a broader search: (((( werner nagel ) OR ( werner happel ))) or ( werner zager )).
• Adding a wildcard symbol may retrieve word variants: (((("werner nagel") OR ("werner happel"))) or ("werner zager"))*.