Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky tang xa hoi. hieu ve cac thuc ((va danh) or (va hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky tang xa hoi. hieu ve cac thuc ((va danh) OR (va hanh)) dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky tang xa hoi. hieu ve cac thuc ((va danh) or (va hanh)) dai cua tre*.