Perhaps you should try some spelling variations:
passiv » passive, massiv
passiver » passiveer, massiver, passive, passively, passiert
passiven » passiveen, massiven, passive, passion
passiveeren » passiveeeren, massiveeren, passivieren, passiverer, passivierende
passieren » passiert

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