Perhaps you should try some spelling variations:
yang guang » yang yang, yang liang
long thanh » luong thanh, long han, long trinh
chia yuan » chiao yuan, chih yuan, chu yuan
yuan wang » yan wang, yuan kang, yuan chang
yan guan » gan guan, yan yuan, yihan guan
wang li » wang lei, wang lin, tang li
li long » i long, ii long, li yulong

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 guan) OR (yang guang)) chia yuan wang li long thanh ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yan guan) or (yang guang)) chia yuan wang li long thanh ;*.