Perhaps you should try some spelling variations:
liang yang » liang ying, wang yang, yang yang
zhang ying » zhang ming, zhang jing, zhang ping
sang minh » kang minah, anh minh, song min
tong shui » tong hui, cong shu
gong hui » tong hui, wang hui, gong si
li sang » le sang, li gang, li san
li li » li lin, li l, li lu

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 ((liang yang) OR (zhang ying)) li li sang minh ((tong shui) OR (gong hui)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) or (zhang ying)) li li sang minh ((tong shui) OR (gong hui)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (zhang ying)) li li sang minh ((tong shui) OR (gong hui)) ;*.