Perhaps you should try some spelling variations:
minh thang » binh thang, binh thanh
thang chen » chang chen, kang chen, zhang chendi
wang sang » wang yang, wang liang, wang jing
wang yong » wang yang, wang hyoung, wang shiyong
sang minh » kang minah, anh minh, song min
yan guan » gan guan, yan yuan, yang guang
yang yue » wang yue, yang yun, yang jui

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 ((((yan guan) OR (yang yue))) OR (wang yan)) wang sang minh thang chen ;~.
• Adding a wildcard symbol may retrieve word variants: wang yong ((((yan guan) or (yang yue))) or (wang yan)) wang sang minh thang chen ;*.