Perhaps you should try some spelling variations:
dong yang » dong hoang, wang yang, dan yang
yang yang » wang yang, wang yan
hua brain » human brain, a brain, hua ban
brain yan » brain gain, brain a
dong nan » dong bin, dong cao
jiu cong » li cong
yan jiu » yang jie, yang jin, pang jiu
sin » sign, sind, skin

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 nan) OR (dong yang))) OR (yang yang))) OR (dong sin)) ya hua brain yan jiu cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((dong nan) OR (dong yang))) or (yang yang))) or (dong sin)) ya hua brain yan jiu cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((((((dong nan) OR (dong yang))) or (yang yang))) or (dong sin)) ya hua brain yan jiu cong shu ;*.