Perhaps you should try some spelling variations:
zhang ying » zhang ming, zhang jing, zhang ping
yang yang » wang yang, wang yan
sang minh » kang minah, anh minh, song min
minh tung » dinh tung, minh cong, ming hung
tung hui » tong hui, wang hui, tung duc
xi li » xi ai
li li » li lin, li l, li lu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((zhang ying) or (yang yang)) ((xi li) OR (li li)) sang minh tung hui ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((zhang ying) OR (yang yang)) ((xi li) OR (li li)) sang minh tung hui ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((zhang ying) or (yang yang)) ((xi li) OR (li li)) sang minh tung hui ;*".