Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passivener » passiveener, passiverener, passiveer, passioner, passiverer, passiver, passiverwerb
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 passiven) OR passivener) OR massiv).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiven) or passivener) or massiv)".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiven) or passivener) or massiv)*.