Perhaps you should try some spelling variations:
passiven » passive, passion
massiv » massive
massiven » massiveen, massive, massively
massiveen » massiveeen, massivement, massivsten, massigeren
passieren » passiert

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