Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passiveren » passiveeren, massiveren, passivereren, passivieren, passieren, passiverer
passivierender » passiveierender, massivierender, passiverierender, passivierende, aktivierender, passivieren

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 passiveren)) OR passivierender)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passiven OR passiveren)) or passivierender)*".