Perhaps you should try some spelling variations:
china grain » china gain, china main, china plain
yang liang » wang liang, yan liang, yang yang
wang yuan » wang yuhan, wang yan, fang yuan
yuan wang » yan wang, yuan kang, yuan chang
chun lan » chia lan, chun wai
yang jin » yang jie, yang jun, ying jin

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yuan wang ((chun lan) or (china grain)) ((yang liang) or (yang jin)) dang (hai OR haji) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yuan wang ((chun lan) OR (china grain)) ((yang liang) OR (yang jin)) dang (hai OR haji) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yuan wang ((chun lan) or (china grain)) ((yang liang) or (yang jin)) dang (hai OR haji) ;*".