Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
danh du » danh dau, danh tu, dinh du
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
su van » tu van, vu van
du cuu » tu cuu
vu sac » vu sach, vu san, va sac
o hoc » co hoc, mo hoc, so hoc
su va » tu va
o hoi » co hoi, o hai, o hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky nang ((o hoi) or (o hoc)). hieu viec cac ((su va) OR (su van)) danh du cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky nang ((o hoi) OR (o hoc)). hieu viec cac ((su va) OR (su van)) danh du cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky nang ((o hoi) or (o hoc)). hieu viec cac ((su va) OR (su van)) danh du cuu tre*".