Perhaps you should try some spelling variations:
den transfer » gene transfer, data transfer, land transfer
transfer bei » transfer beim, transfers bei, transfer der
transfer dau » transfers dau, transfer der, transfer a
bei maria » bei martin, bei martha, de maria
luis a » luis f, luis c
a heat » a heart, _ heat, a head
a den » _ den, a der, a des

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 den transfer bei maria ) OR ( luis a heat transfer dau _ ))~.
• Adding a wildcard symbol may retrieve word variants: (( luis a den transfer bei maria ) or ( luis a heat transfer dau _ ))*.