Perhaps you should try some spelling variations:
massiv » massive
massiveen » massiveeen, massiven, massivement, massivsten
passiven » passive, passion
passiverer » passiverwerb, passivieren, passieren, passiveer, passivelyer, passierter
passiver » passive, passively, 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: ((massiv OR (passiven OR massiveen)) OR (passiverer OR passiver)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((massiv or (passiven or massiveen)) or (passiverer OR passiver))".
• Adding a wildcard symbol may retrieve word variants: ((massiv or (passiven or massiveen)) or (passiverer OR passiver))*.