Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, massively
massiver » massiveer, massive, passiver, massively
passivieren » passivierende, passivierung, passieren
passiven » passive, passion
passivener » passiveer, passioner, passiverer, passiver, passiverwerb

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: (massiv OR ((passivieren OR massiven) OR ((passiven OR passivener) OR massiver))).
• Adding a wildcard symbol may retrieve word variants: (massiv or ((passivieren or massiven) or ((passiven or passivener) or massiver)))*.