Perhaps you should try some spelling variations:
quoc lan » quoc ban, nuoc luan, quoc quan
su sach » so sach, vu sach
lan anh » van anh, tuan anh
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
va cam » va cac, va cao, va cai
y nang » ky nang, ly nang, v nang
anh ve » hanh ve, anh va, anh viet
ve cua » le cua, de cua, te cua
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: su sach y nang ((x hoi) OR (o hoi)). hieu ((va cam) OR (va cham)) quoc lan anh ve cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((x hoi) or (o hoi)). hieu ((va cam) OR (va cham)) quoc lan anh ve cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((x hoi) or (o hoi)). hieu ((va cam) OR (va cham)) quoc lan anh ve cua tre*.