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