Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song min
liang li » ling li, qiang li, liang wei
yan yan » yan yuan, nan yan, wang yan
li sang » le sang, li gang, li san
wang » wing, wan, lang
cong » congo, long, hong

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 yan) OR (yang yang)) liang li sang minh cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yan yan) or (yang yang)) liang li sang minh cong shu ;*.