Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
cap nuoc » dat nuoc
can nuoc » cac nuoc, can cuoc, chan nuoi
va hanh » van hanh, va thanh, va danh
te sach » toc sach
sach ty » sach y, sach tu, sach thu
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
vi hoa » voi hoa, vi hoc, va hoa

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: te sach ty nang ((mai hoi) OR (lai hoi)). hieu viec ((can nuoc) OR (cap nuoc)) va hanh vi hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ((mai hoi) or (lai hoi)). hieu viec ((can nuoc) OR (cap nuoc)) va hanh vi hoa viet~".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((mai hoi) or (lai hoi)). hieu viec ((can nuoc) OR (cap nuoc)) va hanh vi hoa viet*.