Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passiverere » massiverere, passivenerere, passivererere, passiverer, passivierende, passivierbare
passiverwerb » massiverwerb, passivenerwerb, passivererwerb, passiverer
passivererwerb » massivererwerb, passivenererwerb, passiverererwerb

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