Perhaps you should try some spelling variations:
coal exports » total exports, oil exports, real exports
exports can » exporters can, exports clean, exports main
data mean » data map
mean coal » clean coal, mean cvar, than coal
dong iii » dong sin, dong di, dong bin
iii data » ii data, iii das, mri data
yang jin » yang jie, yang jun, ying jin
yang jui » yang judy, yang yi
yang xi » yang yi

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: dong iii data mean coal exports can ((yang jin) OR (((((yang jui) OR (yang xi))) OR (yang di)))) ;~.
• Adding a wildcard symbol may retrieve word variants: dong iii data mean coal exports can ((yang jin) or (((((yang jui) or (yang xi))) or (yang di)))) ;*.