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