Perhaps you should try some spelling variations:
dong cao » dong xiao, dan cao, dong nan
hua gain » heat gain, run gain, hua ban
yang jin » yang jie, yang jun, ying jin
long shu » cong shu, tong shui, long du
wong sau » wong sam, wong siu, wong shiu
yan jiu » yang jie, pang jiu
sin » sign, sind, skin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong cao) or (dong sin)) ya hua gain ((yan jiu) or (yang jin)) ((long shu) OR (wong sau)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong cao) OR (dong sin)) ya hua gain ((yan jiu) OR (yang jin)) ((long shu) OR (wong sau)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong cao) or (dong sin)) ya hua gain ((yan jiu) or (yang jin)) ((long shu) OR (wong sau)) ;*".