Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
va thanh » ban thanh, va tinh, le thanh
va danh » va dinh, va dan, va hanh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
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 thanh) OR (gia thanh)))) 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 thanh) OR (gia thanh)))) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky tang xa hoi. hieu ve cac thuc ((va danh) or (((va thanh) OR (gia thanh)))) 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 thanh) OR (gia thanh)))) dai cua tre*.