Perhaps you should try some spelling variations:
transfer costs » transport costs, transfer amounts
data transfer » cash transfer
luis rdf » luis f, luis de
rdf data » dlf data, imf data
de carl » des carl, de cara, de care
dr carl » dr karl
luis a » luis f, luis c
a heat » a heart, _ heat, a head

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 a heat transfer ((de carl) OR (dr carl)) ) OR ( luis rdf data transfer costs _ ))~.
• Adding a wildcard symbol may retrieve word variants: (( luis a heat transfer ((de carl) or (dr carl)) ) or ( luis rdf data transfer costs _ ))*.