Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passive » massive, passivere
passiveren » massiveren, passivereren, passivieren, passieren, passiverer
passiveeren » massiveeren, passivereeren, passivieren, passieren, 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 passiven) OR (passive OR (passiveren OR passiveeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv OR passiven) or (passive or (passiveren or passiveeren)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv OR passiven) or (passive or (passiveren or passiveeren)))*.