Perhaps you should try some spelling variations:
passiv » passiven, passiver
passive » passivene, passivere
massiv » massive
massiven » massiveen, massive, passiven, massively
massigen » massiger, massige, massigung

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