Perhaps you should try some spelling variations:
passiv » passiven, passiver
passiverer » passivenerer, passivererer, passiverwerb, passivieren, passiver
passivierenen » passivenierenen, passiverierenen, passivierenden, passivierender, passivieren
passively » passivenely, passiverely, massively, passivity, passiven
passive » passivene, passivere
massiv » massive

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 passivierenen) OR passively)) OR massiv) OR passive).
• Adding a wildcard symbol may retrieve word variants: (((passiv or ((passiverer or passivierenen) or passively)) or massiv) or passive)*.