Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver
passivierender » massivierender, passivenierender, passiverierender, passivierende, aktivierender, passivieren
passive » massive, passivene, passivere

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: ((passiv OR (passiverer OR passivierender)) OR passive)*.