Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sai cua » dai cua, hai cua, lai cua
nam dan » nam dinh
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
he nam » ha nam, nghe nam
ma hoi » xa hoi, ma hoa, 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 (mai hoi)). hieu he nam thu ((dia ban) or (nam dan)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu he nam thu ((dia ban) OR (nam dan)) sai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu he nam thu ((dia ban) or (nam dan)) sai cua tre*".