Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua dieu
ky sang » ky nang, ky dang, ky tang
sang ma » tang ma, nang ma, sang tao
hieu le » hieu ve, hieu he, hieu ly
va hanh » van hanh, va thanh, va danh
su sac » su sach, su cac, su xac
va dan » ca dan, va dao, va dau
sac ky » cac ky, sai ky
le nam » ly nam, he nam, le na
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky sang ma hoi. hieu le nam thu ((va hanh) or (va dan)) di ((cua viet) OR (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang ma hoi. hieu le nam thu ((va hanh) OR (va dan)) di ((cua viet) OR (cua vat)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky sang ma hoi. hieu le nam thu ((va hanh) or (va dan)) di ((cua viet) OR (cua vat))".
• Adding a wildcard symbol may retrieve word variants: su sac ky sang ma hoi. hieu le nam thu ((va hanh) or (va dan)) di ((cua viet) OR (cua vat))*.