Perhaps you should try some spelling variations:
passiv » passiven
passiver » passivener, passiven, passively, passiert
passive » passivene
passivieren » passivenieren, passivierende, passivierung, passieren
massiv » massive

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 passive) OR massiv) OR passivieren).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv OR passiver) or passive) or massiv) or passivieren)".
• Adding a wildcard symbol may retrieve word variants: ((((passiv OR passiver) or passive) or massiv) or passivieren)*.