Perhaps you should try some spelling variations:
river transport » air transport, water transport, private transport
transport mode » transport modes
based transfer » based transfers, basin transfer, basin transfers
vague key » value keys, sage key, vague de
key river » key driver, key drivers, red river
guias les » guide les, guias de
les based » les bases, aes based, ses based
mode a » mode ad, mode _, code a

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( vague key river transport mode a ) or ( guias les based transfer _ a ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( vague key river transport mode a ) OR ( guias les based transfer _ a ))*.