Perhaps you should try some spelling variations:
world transformer » world transformed, world transforming, could transform
language change » language usage
river transport » air transport, water transport, private transport
higher costs » higher cost, high costs, higher losses
change river » change driver, change drivers, change driven
transport a » transport _, transport data
undp world » und world, up world, 2nd world
ca undp » ca und

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: (( ca undp world transformer higher costs ) OR ( language change river transport a model ))~.
• Adding a wildcard symbol may retrieve word variants: (( ca undp world transformer higher costs ) or ( language change river transport a model ))*.