Perhaps you should try some spelling variations:
transfer operations » transfer operators, transport operations, transit operations
des transfer » des transfers, den transfer, der transfer
from martin » from margins, from main, from marine
luis rdf » luis f, luis de
luis 3 » luis f, luis c, luis a
3 des » 3 der, 3 das, a des
heat » 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 3 des transfer from martin ) OR ( luis rdf heat transfer operations _ ))~.
• Adding a wildcard symbol may retrieve word variants: (( luis 3 des transfer from martin ) or ( luis rdf heat transfer operations _ ))*.