Perhaps you should try some spelling variations:
"werks von siemens inge" » "werks von siemens ingo" (Expand Search), "werks von siemens ingoe" (Expand Search), "werks von siemens ginge" (Expand Search)
"werkes von siemens ring" » "werkes von siemens ringo" (Expand Search), "werkes von siemens rging" (Expand Search)
"wirken von siemens ing" » "wirken von siemens ingo" (Expand Search), "wirken 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: (((("werks von siemens inge") OR ("werkes von siemens ring"))) OR ("wirken von siemens ing"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"werks von siemens inge\") OR (\"werkes von siemens ring\"))) OR (\"wirken von siemens ing\"))*".
• Removing quotes may allow a broader search: (((( werks von siemens inge ) OR ( werkes von siemens ring ))) OR ( wirken von siemens ing ))*.