Perhaps you should try some spelling variations:
passiven » passion
massiveren » massivere, massigeren, massivement
passivieren » passivierung, passieren, passagieren
passivierende » passivierungde, passierende, passagierende, passivierender, aktivierende, passivierung
passierende » passerende, grassierende, haussierende

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