Perhaps you should try some spelling variations:
"freiheit von siemens ring" » "freiheit vor siemens ring" (Expand Search), "freiherr von siemens ring" (Expand Search), "freiheit floh siemens ring" (Expand Search)
"zeit von siemens fing" » "zeit vor siemens fing" (Expand Search), "zeiten von siemens fing" (Expand Search), "gert von siemens fing" (Expand Search)
"retter von siemens inge" » "retter von siemens ingo" (Expand Search), "retter von siemens ing" (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: (("freiheit von siemens ring") OR ((("zeit von siemens fing") OR ("retter von siemens inge"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"freiheit von siemens ring\") OR (((\"zeit von siemens fing\") OR (\"retter von siemens inge\"))))*".
• Removing quotes may allow a broader search: (( freiheit von siemens ring ) OR ((( zeit von siemens fing ) OR ( retter von siemens inge ))))*.