Perhaps you should try some spelling variations:
massiv » massive
passiverer » passiverwerb, passivieren, passieren, passiveer, passivener, passierter, massiverer, passivierenr, passiviertr
passiver » passive, passiven, passiert
passivere » passivee, passivene, passierte, massivere, passivieren, passiviert
passively » massively, passive, passivity

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 (passiverer OR passiver)) OR (passivere OR passively)).
• Adding a wildcard symbol may retrieve word variants: ((massiv or (passiverer or passiver)) or (passivere or passively))*.