Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song ming
song min » song ming, gong min, jong min
yan yang » yang yang, yao yang, dan yang
long shu » cong shu, tong shui, long du
wan yan » wang yan, nan yan, wai yan
xi ai » ai ai, i ai, ii ai
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: wan yan yang ((xi ai) OR (li li)) ((song min) OR (sang minh)) long shu ;~.
• Adding a wildcard symbol may retrieve word variants: wan yan yang ((xi ai) or (li li)) ((song min) or (sang minh)) long shu ;*.