Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
dau nuoc » dat nuoc, dau ngoc, cap nuoc
hieu van » hieu va, thien van, lieu va
va danh » va dinh, va hanh, dia danh
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
van dau » van dao, phan dau
ma hoi » xa hoi, ma hoa, me hoi
va dan » ca dan, va dao, va dau
de cua » le cua, te cua, dieu cua

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: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van dau nuoc ((va danh) OR (va dan)) de cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van dau nuoc ((va danh) or (va dan)) de cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van dau nuoc ((va danh) or (va dan)) de cua viet*.