Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
hanh dai » hanh tai, hanh dao, vanh dai
thu sach » tu sach, thuat sach, thuoc sach
luu van » cuu van, luan van, luu hanh
luc van » luoc van, duc van, luc va
su sach » so sach, vu sach
nang o » nang co, nang ho, nang ro
y nang » ky nang, ly nang, v nang
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) y nang o hoi. hieu viec cac ((luc van) or (luu van)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) y nang o hoi. hieu viec cac ((luc van) OR (luu van)) hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) y nang o hoi. hieu viec cac ((luc van) or (luu van)) hanh dai cua te*.