Perhaps you should try some spelling variations:
transport code » transport mode, transport modes, transport model
sub transport » bus transport, sea transport, du transport
transfer a » transfer _, transfer 3, transfer 4
idle cash » idle case
case sub » case sums, case s0
due cash » does cash, due care, do cash
a a » a la

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