Perhaps you should try some spelling variations:
passiven » passion
passivere » passiver, massivere, passivieren
passiverely » passiverly, massiverely, passivierenly, passively, passiverwerb
passiverer » passiverr, massiverer, passivierenr, passiverwerb, passivieren, passiver
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: ((passiven OR ((passive OR passivere) OR (passiverely OR passiverer))) OR massiv).
• Adding a wildcard symbol may retrieve word variants: ((passiven or ((passive or passivere) or (passiverely or passiverer))) or massiv)*.