Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh vai » hanh vi, hanh va, hanh tai
tu cham » toc cham, thi cham
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vu cham » va cham, vu kham, qua cham
y nang » ky nang, ly nang, v nang
co hoi » co hoc
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang ((co hoi) OR (co loi)). hieu ((vu cham) or (tu cham)) lo va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang ((co hoi) OR (co loi)). hieu ((vu cham) OR (tu cham)) lo va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang ((co hoi) OR (co loi)). hieu ((vu cham) or (tu cham)) lo va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang ((co hoi) OR (co loi)). hieu ((vu cham) or (tu cham)) lo va hanh vai cua tre*.