Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve bach » ve cach, vu bach, vi bach
va hanh » van hanh, va danh, ban hanh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, 5 hoi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (x ho)). hieu ve bach tuoc ((va hanh) OR (va thanh)) lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((x hoi) or (x ho)). hieu ve bach tuoc ((va hanh) OR (va thanh)) lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (x ho)). hieu ve bach tuoc ((va hanh) OR (va thanh)) lai cua tre*.