Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
cac chuc » cac chu, cac chung, cach thuc
van tuan » van quan, van ban, anh tuan
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
x hoi » xa 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: nuoc sach ky nang ((x hoi) OR (o hoi)). hieu ve cac chuc ((van hanh) OR (van tuan)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach ky nang ((x hoi) OR (o hoi)). hieu ve cac chuc ((van hanh) or (van tuan)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: nuoc sach ky nang ((x hoi) OR (o hoi)). hieu ve cac chuc ((van hanh) or (van tuan)) di cua tre*.