Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
hua gain » heat gain, run gain, hua ban
gain yan » gain a, nan yan
long shu » cong shu, tong shui
yan jiu » yang jie, yang jin, pang jiu
long du » long d, long do, long run

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

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