Perhaps you should try some spelling variations:
yang liang » wang liang, yan liang, yang yang
yong yang » yang yang, dong yang, kyoung yang
ying yang » yang yang, yin yang, ying chang
yang linh » yang lin, yang jin, wang lin
hoang hai » hong hai, dang hai, hoang h
hua gene » human gene, a gene, hua ren

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: wang ((yong yang) OR (ying yang)) hua gene ((yang linh) OR (yang liang)) hoang hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yong yang) OR (ying yang)) hua gene ((yang linh) or (yang liang)) hoang hai ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yong yang) OR (ying yang)) hua gene ((yang linh) or (yang liang)) hoang hai ;*.