Perhaps you should try some spelling variations:
wang liang » wang yang
yang guang » yang yang, yan guan, yang liang
daun vang » daun yang
vang vie » vang viet, nang viet, vang va
vie dans » vie des
qian yi » qian yan
man » main, many, mean
hadi » had

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: man houng ((((wang liang) OR (yang guang))) OR (qian yi)) daun vang vie dans hadi ;~.
• Adding a wildcard symbol may retrieve word variants: man houng ((((wang liang) or (yang guang))) or (qian yi)) daun vang vie dans hadi ;*.