Perhaps you should try some spelling variations:
passiv » massiv, passiver
passive » massive, passivere
passiven » massiven, passiveren, passion
passivierende » massivierende, passiverierende, passivierender, passivieren, aktivierende
massiveren » massivere, massigeren, massivement
passieren » passiert

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