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

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) or (hiem he)) nam thu ((va hanh) or (va dan)) de cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky sang ma hoi. ((hieu le) OR (hiem he)) nam thu ((va hanh) OR (va dan)) de cua viet.
• Adding a wildcard symbol may retrieve word variants: su sac ky sang ma hoi. ((hieu le) or (hiem he)) nam thu ((va hanh) or (va dan)) de cua viet*.