Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
hieu va » lieu va, hieu qua
thu san » thuy san, thu ban, phu san
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thu san)) ky nang o lai. hieu va cac ((duc ban) or (dua ban)) hanh tri cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu san)) ky nang o lai. hieu va cac ((duc ban) OR (dua ban)) hanh tri cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu san)) ky nang o lai. hieu va cac ((duc ban) or (dua ban)) hanh tri cua tre*.