Perhaps you should try some spelling variations:
transformer varied » transformer based, transformer infrared
dc transformer » _ transformer, 3 transformer, a transformer
varied across » varies across, carried across, vary across
transfers et » transferts et, transfert et, transfers bei
et macao » _ macao
bis end » bis ende
luis pe » luis e, luis de

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: (( bis end dc transformer varied across ) OR ( luis pe _ transfers et macao ))~.
• Adding a wildcard symbol may retrieve word variants: (( bis end dc transformer varied across ) or ( luis pe _ transfers et macao ))*.