Perhaps you should try some spelling variations:
passiv » massiv
passiver » massiver, passively, passiert
passiven » massiven, passion
passive » massive
passivieren » massivieren, passivierende, passivierung, passieren

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((passiv OR passiver) OR ((passiven OR passive) OR passivieren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or passiver) or ((passiven OR passive) or passivieren))*".