Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh va, hanh tai
hau loc » huu loc, phau hoc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cau loc » cau hoc, cau luc, cau long
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
x hoi » o hoi, x ho, 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: thuat sach y nang ((x hoi) OR (xa hoi)). hieu va ((cau loc) OR (hau loc)) va hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang ((x hoi) OR (xa hoi)). hieu va ((cau loc) or (hau loc)) va hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang ((x hoi) OR (xa hoi)). hieu va ((cau loc) or (hau loc)) va hanh vai cua tre*.