Perhaps you should try some spelling variations:
massiv » massive
massiven » massiveen, massive, passiven, massively
passively » massively, passive, passivity
passivieren » passivierende, passivierung, passieren
passiveneer » passiverer, 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 passively) OR (passivieren OR massiven)) OR passiveneer)*.