Perhaps you should try some spelling variations:
transfer operations » transfer operators, transport operations, transit operations
transfer axiom » transfer from, transfer asia
head transfer » heat transfer, heart transfer, load transfer
sea transfer » heat transfer, net transfer, a transfer
luis a » luis f, luis c
a head » _ head
a sea » _ sea, a set

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 head transfer axiom martin ) OR ( luis a sea transfer operations _ ))~.
• Adding a wildcard symbol may retrieve word variants: (( luis a head transfer axiom martin ) or ( luis a sea transfer operations _ ))*.