Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivenner » massivenner, passivenenner, passiverenner, klassevenner, passiverwerb
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver
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 (passivenner OR passiverer)) OR passive)*.