Perhaps you should try some spelling variations:
sang minh » kang minah, anh minh, song min
long shu » cong shu, tong shui, long du
yan yang » yang yang, yao yang, dan yang
gong min » jong min, song min, gong meng
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 li) OR (xi ai))) OR (li li)) ((gong min) OR (sang minh)) long shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yan yang ((((xi li) OR (xi ai))) or (li li)) ((gong min) or (sang minh)) long shu ;~".
• Adding a wildcard symbol may retrieve word variants: wan yan yang ((((xi li) OR (xi ai))) or (li li)) ((gong min) or (sang minh)) long shu ;*.