Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
xac va » tac va, ac va, bac va
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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: thu sach y nang o hoi. hieu ve cac ((xac va) OR (duc va)) hanh dai cua te~.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. hieu ve cac ((xac va) or (duc va)) hanh dai cua te*.