Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passively » passiveely, massively, passiverely, passive, passivity
passiven » passiveen, massiven, passiveren, passive, passion
passivere » passiveere, massivere, passiverere, passiverer, passiver
passiverwerb » passiveerwerb, massiverwerb, passivererwerb, passiverer

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 passively) OR (passiven OR passivere)) OR passiverwerb).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passively) or (passiven or passivere)) or passiverwerb)*.