Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
than luc » nhan luc, than duc, thanh luu
cua tre » cua te, cuu tre, cua triet
lai cua » dai cua, hai cua, lai chau
luc van » luoc van, luu van, duc van
va than » va thanh, van than, va phan
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
tu cai » tu cac, tu can, tu bai
tu sai » tu bai, tu san, tu lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu va than luc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu cai)) ky nang ((ma hoi) OR (mai hoi)). hieu va than luc van hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu va than luc van hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) OR (tu cai)) ky nang ((ma hoi) or (mai hoi)). hieu va than luc van hanh lai cua tre*.