Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
than luc » nhan luc, than duc, thanh luu
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
va than » va thanh, van than, va phan
cua tre » cua te, cuu tre, cua triet
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
sai ky » sac ky
ma hoi » xa hoi, ma hoa, me hoi
tu sai » tu bai, tu san, tu cai

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