Perhaps you should try some spelling variations:
transformer varied » transformer based, transformer infrared
der transformer » dc transformer, se transformer, der transferamter
varied across » varies across, carried across, vary across
bias index » bios index
index der » index des
a money » a monkey, e money, 2 money
luis a » luis f, luis c

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( bias index der transformer varied across ) or ( luis a money transfer _ macao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( bias index der transformer varied across ) OR ( luis a money transfer _ macao )).
• Adding a wildcard symbol may retrieve word variants: (( bias index der transformer varied across ) or ( luis a money transfer _ macao ))*.