Perhaps you should try some spelling variations:
hiem ngheo » giam ngheo, nhiem nghe
hieu nghe » lieu nghe, nhiem nghe, hieu he
nam thuc » nam thuoc, am thuc, nam thu
danh dai » danh dau, danh di, danh sai
tu sach » thu sach, su sach, te sach
thuc xa » thuc xay, tuc xa, thuc va
xa danh » va danh, dia danh, nam danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) or (v nang)) x ho. ((hieu nghe) OR (hiem ngheo)) nam thuc xa danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) x ho. ((hieu nghe) OR (hiem ngheo)) nam thuc xa danh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) x ho. ((hieu nghe) OR (hiem ngheo)) nam thuc xa danh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) x ho. ((hieu nghe) OR (hiem ngheo)) nam thuc xa danh dai cua tre*.