Perhaps you should try some spelling variations:
passiv » passiver
passiven » passiveren, passion
passive » passivere
massiv » massive
massiveren » massiveeren, massivere, massigeren, massivement
massiveeren » massiveeeren, massivere, passivieren, massigeren

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