Perhaps you should try some spelling variations:
clean transport » urban transport, green transport, sea transport
ocean transport » urban transport, green transport, sea transport
transport em » transport en, transport et, transport amp
transport a » transport _, transport data
de ocean » d ocean, deep ocean, del oceano
a clean » _ clean, a clear
luis de » luis e
luis a » luis f, luis c
a acao » a adocao

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( luis a clean transport a acao ) or ( luis de ocean transport em acao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( luis a clean transport a acao ) OR ( luis de ocean transport em acao ))*.