Perhaps you should try some spelling variations:
transit system » transit systems, transport system, transport systems
a transformer » _ transformer, a transformed, 3 transformer
system peter » system better, system after, system paper
agua en » agua e
2 den » _ den, 2 der, i den
2 des » 2 der, 2 das, a des
en a » en la, e a, et a

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 ((2 den) OR (2 des)) transit system peter ) OR ( agua en a transformer _ macao ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( agua ((2 den) OR (2 des)) transit system peter ) or ( agua en a transformer _ macao ))~".
• Adding a wildcard symbol may retrieve word variants: (( agua ((2 den) OR (2 des)) transit system peter ) or ( agua en a transformer _ macao ))*.