Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passiveren » massiveren, passiveneren, passivereren, passivieren, passieren, passiven
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiven » massive, passiven, massively

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