Perhaps you should try some spelling variations:
yang liang » wang liang, yan liang, yang yang
hoang hai » hong hai, dang hai, hoang h
yan yang » yang yang, yao yang, dan yang
yang lin » yang jin, wang lin, yang li
hua ren » hua chen
a gene » a genre, a gender, a gentle
wang » wing, wan, lang

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 yan yang ((hua ren) OR (a gene)) ((yang lin) OR (yang liang)) hoang hai ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan yang ((hua ren) or (a gene)) ((yang lin) or (yang liang)) hoang hai ;*.