Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massiven » massiveen, massive, passiven
massively » massiveely, massive
massivere » massiveere, massiver, massive, passiver
massigeren » massiger, massigen, massierer

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