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
den transfer » gene transfer, heat transfer, data transfer
luis de » luis e
de head » her head, per head, red head
luis c » luis f
c den » co den, _ den, c der

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