Perhaps you should try some spelling variations:
transformer costs » transfer costs, transport costs, transformer based
dc transformer » _ transformer, 3 transformer, a transformer
costs across » scores across, risks across
transfer bei » transfer beim, transfers bei, transfer der
bei cara » bei carl, bei carnap, bei barad
luis e » luis f, luis c, luis a
e heat » _ heat, a heat, 1 heat

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: (( luis (rene OR rent) dc transformer costs across ) OR ( luis e heat transfer bei cara ))~.
• Adding a wildcard symbol may retrieve word variants: (( luis (rene or rent) dc transformer costs across ) or ( luis e heat transfer bei cara ))*.