Perhaps you should try some spelling variations:
yang liang » wang liang, yan liang, yang yang
wang dong » wang yong, wang hong, wang yang
dong yang » dong hoang, wang yang, yang yang
hoang hai » hong hai, dang hai, hoang h
hua gene » human gene, hua ren, hy5 gene
yang lin » yang jin, wang lin, yang li
a gene » a genre, a gender, a gentle

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