Perhaps you should try some spelling variations:
passiv » passiver
passiven » passiveren, passion
passive » passivere
passiveeren » passivereeren, passivieren, passieren, passiverer
massiv » massive
massiveren » massiveeren, massivere, massigeren, massivement

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