Perhaps you should try some spelling variations:
passiv » passive, passiver
passiven » passiveen, passiveren, passive, passion
passively » passiveely, passiverely, massively, passive, passivity
massiv » massive
massiveen » massiveeen, massiven, massivement, massivsten

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 passiven) OR massiv) OR passively) OR massiveen)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv OR passiven) or massiv) or passively) or massiveen)*".