Perhaps you should try some spelling variations:
hiem ngheo » giam ngheo, nhiem nghe
hieu nghe » lieu nghe, nhiem nghe, hieu he
danh hai » dang hai, lanh hai, manh hai
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, va hanh
san thu » san thuc, van thu, san phu
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
thu va » thuc va, thue va, tu va
ma hoi » mai hoi, xa hoi, me hoi

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 ky nang ((ma hoi) or (ma hoa)). ((hieu nghe) OR (hiem ngheo)) san thu va danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). ((hieu nghe) OR (hiem ngheo)) san thu va danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (ma hoa)). ((hieu nghe) OR (hiem ngheo)) san thu va danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (ma hoa)). ((hieu nghe) OR (hiem ngheo)) san thu va danh hai cua tre*.