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