Perhaps you should try some spelling variations:
transfer schemes » transfer scheme, transfer systems
al transformer » a transformer, ray transformer, _ transformer
gene transfer » wire transfer, heat transfer, file transfer
schemes part » schemes fare, schemes pro, schemes pt
2.1 macao » 2.1 lacan, 2.1 mao, 2.1 marco
2.1 macro » 4.1 macro, 2.2 macro, 2.4 macro
agua et » agua e

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: (( agua _ gene transfer schemes part ) OR ( agua et al transformer ((2.1 macao) OR (2.1 macro)) ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( agua _ gene transfer schemes part ) or ( agua et al transformer ((2.1 macao) OR (2.1 macro)) ))~".
• Adding a wildcard symbol may retrieve word variants: (( agua _ gene transfer schemes part ) or ( agua et al transformer ((2.1 macao) OR (2.1 macro)) ))*.