Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
luc van » luoc van, luu van, duc van
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
te bai » te bao, te ban, te lai
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te bai) or (te tai)) ky lang xa hoi. hieu va cau luc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te bai) OR (te tai)) ky lang xa hoi. hieu va cau luc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te bai) or (te tai)) ky lang xa hoi. hieu va cau luc van hanh tai cua tre*.