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
sin data » main data, own data, von data
yang jun » pang jun, yang jin, yang judy
yang jui » yang judy, yang xi
yang yi » yang xi
dong » doing, long, done

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