Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passieren, passiverer
massiven » massive, passiven, massively
massigeren » massigen, massivere, massierer, massingeren, massiveen, massieen
massiger » massinger, massive, massie
massiverer » massivere, massierer, 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 ((massiven OR massiven) OR ((massigeren OR massiger) OR (passiveeren OR massiverer)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((massiven or massiven) or ((massigeren OR massiger) or (passiveeren or massiverer))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massiven or massiven) or ((massigeren OR massiger) or (passiveeren or massiverer))))*.