Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » va thanh, va danh, ban hanh
day cua » dai cua
cua tre » cua te, cuu tre, cua triet
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky

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

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