Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
dai tuc » dai thuc, dai truc, dao tuc
va danh » va dinh, va hanh, dia danh
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
ma hoi » mai hoi, xa hoi, ma hoa

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: so sach y nang ma hoi. hieu hien dai tuc ((va danh) OR (va dan)) ((lai cua) OR (hai cua)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ma hoi. hieu hien dai tuc ((va danh) or (va dan)) ((lai cua) OR (hai cua)) viet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ma hoi. hieu hien dai tuc ((va danh) or (va dan)) ((lai cua) OR (hai cua)) viet*.