Perhaps you should try some spelling variations:
"vetter von siemens inge" » "retter von siemens inge" (Expand Search), "vater von siemens inge" (Expand Search), "vetter von siemens ginge" (Expand Search)
"werner von siemens ingo" » "weiber von siemens ingo" (Expand Search), "werner von siemens gingo" (Expand Search)
"werkes von siemens ing" » "wirken von siemens ing" (Expand Search), "werkes von siemens ging" (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: (((("vetter von siemens inge") OR ("werner von siemens ingo"))) OR ("werkes von siemens ing"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"vetter von siemens inge\") OR (\"werner von siemens ingo\"))) OR (\"werkes von siemens ing\"))*".
• Removing quotes may allow a broader search: (((( vetter von siemens inge ) OR ( werner von siemens ingo ))) OR ( werkes von siemens ing ))*.