Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passagieren, passivierender
passivierung » passiveierung, massivierung, passivenierung, aktivierung
passieren » passiert, passiven
massiveren » massivere, massivement, massiven
massigeren » massiger, massigen, massivere

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