Perhaps you should try some spelling variations:
massiven » massive, massively, massiv
passiven » passion
massiveand » passiveand
passivierende » passivierender, aktivierende, passivierung, passivierungde, passierende, passagierende
passivieren » passivierung, passieren, passagieren

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