Perhaps you should try some spelling variations:
nhieu viec » nhien viet
hanh thai » nhanh thai, hinh thai, hanh tai
hieu viec » hieu ve, sieu viet, hieu hien
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
o hoi » o hoc, 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: te sach y nang ((o hoi) or (co hoi)). ((hieu viec) OR (nhieu viec)) cac xuc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((o hoi) OR (co hoi)). ((hieu viec) OR (nhieu viec)) cac xuc van hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((o hoi) or (co hoi)). ((hieu viec) OR (nhieu viec)) cac xuc van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((o hoi) or (co hoi)). ((hieu viec) OR (nhieu viec)) cac xuc van hanh thai cua tre*.