Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dai truc » dai thuc, doan truc, dai trung
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
vai cua » dai cua, hai cua, lai cua
vi cua » di 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: ((so sach) OR (bo sach)) ly nang ma hoa. hieu hien dai truc va danh ((vi cua) OR (vai cua)) vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) ly nang ma hoa. hieu hien dai truc va danh ((vi cua) OR (vai cua)) vat~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ly nang ma hoa. hieu hien dai truc va danh ((vi cua) OR (vai cua)) vat*.