Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiver » massiver, passivener, passiven, passively
passivener » massivener, passivenener, passiverer, passiven, passiverwerb
passive » massive, passivene
massiven » massive, passiven, massively
massiveren » massivere, massigeren, massivement

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 passivener) OR passiert)) OR passive) OR (massiven OR massiveren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or ((passiver OR passivener) or passiert)) or passive) or (massiven or massiveren))".
• Adding a wildcard symbol may retrieve word variants: (((passiv or ((passiver OR passivener) or passiert)) or passive) or (massiven or massiveren))*.