Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
than luc » nhan luc, than duc, thanh luu
van hanh » ban hanh, van anh, van ban
cua tre » cua te, cuu tre, cua triet
lai cua » dai cua, hai cua, lai chau
va than » va thanh, van than, va phan
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
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)). hieu va than luc ((van hanh) OR (van thanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky nang ((ma hoi) OR (mai hoi)). hieu va than luc ((van hanh) OR (van thanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky nang ((ma hoi) or (mai hoi)). hieu va than luc ((van hanh) OR (van thanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky nang ((ma hoi) or (mai hoi)). hieu va than luc ((van hanh) OR (van thanh)) lai cua tre*.