Perhaps you should try some spelling variations:
transport code » transport mode, transport modes, transport model
transfer a » transfer _, transfer 4, transfer der
transfer 3 » transfer _, transfer 4, transfer 3.2
case bus » case b, case big
bias der » bias des, bias over, das der
der mass » der massen, der maske, over mass

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: (( areas case bus transport code _ ) OR ( bias der mass ((transfer a) OR (transfer 3)) a ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( areas case bus transport code _ ) or ( bias der mass ((transfer a) OR (transfer 3)) a ))~".
• Adding a wildcard symbol may retrieve word variants: (( areas case bus transport code _ ) or ( bias der mass ((transfer a) OR (transfer 3)) a ))*.