Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
hieu viec » nhieu viec, hieu ve, sieu viet
cua triet » cua viet, su triet, va triet
viec cac » vien cac, viec cua, viec lam
quoc ban » quoc bao, quoc quan, quoc binh
quoc lan » nuoc luan, quoc quan, quoc danh
hang vai » hang va, hang tai, hang hai
te sach » toc sach
vai cua » dai cua, hai cua, lai cua
nang o » nang co, nang ho, nang ro
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: te sach thieu nang o hoi. hieu viec cac ((quoc ban) or (quoc lan)) hang vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thieu nang o hoi. hieu viec cac ((quoc ban) OR (quoc lan)) hang vai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach thieu nang o hoi. hieu viec cac ((quoc ban) or (quoc lan)) hang vai cua triet*.