Perhaps you should try some spelling variations:
nghe nhan » nghe dan, nghe san, nghe nano
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
nhan tu » nhanh tu, phan tu, nhan su
sai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
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 nhan tu ((va danh) OR (va dinh)) sai 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 nhan tu ((va danh) OR (va dinh)) sai 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 nhan tu ((va danh) OR (va dinh)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (ma hoa)). hieu nghe nhan tu ((va danh) OR (va dinh)) sai cua tre*.