Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massigeren » massiger, massigen, massierer
massivere » massiver, massive, massively
massiveeren » massivdecken, massivteilen

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 (passivieren OR ((massigeren OR massivere) OR massiveeren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passivieren or ((massigeren OR massivere) or massiveeren)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passivieren or ((massigeren OR massivere) or massiveeren)))*.