Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiveren » massiveren, passiveneren, passivieren, passieren, passiverer, passivenen, passivelyen, passierten
passivener » massivener, passivenener, passiverer, passiven, passiverwerb
passiver » massiver, passivener, passiven, passively, passiert
passive » massive, passivene
passioner » passione, passionen, massioner

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 passiveren) OR ((passivener OR passiver) OR passioner)) OR passive).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or passiveren) or ((passivener OR passiver) or passioner)) or passive)".
• Adding a wildcard symbol may retrieve word variants: (((passiv or passiveren) or ((passivener OR passiver) or passioner)) or passive)*.