Perhaps you should try some spelling variations:
transit system » transit systems, transport system, transport systems
a transformed » _ transformed, _ transformer, a transforming
transformed a » transformed _, transformed 1, transformer 1
system power » systems power, system paper, system peter
agua el » agua e, aguas del
a macao » a macro, _ macao
e how » 2 how, 3 how, 4 how
el a » e a, et a, en 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 ((e how) OR (_ how)) transit system power ) OR ( agua el a transformed a macao ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( agua ((e how) OR (_ how)) transit system power ) or ( agua el a transformed a macao ))~".
• Adding a wildcard symbol may retrieve word variants: (( agua ((e how) OR (_ how)) transit system power ) or ( agua el a transformed a macao ))*.