Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thai cua » than cua, tai cuc, tri cua
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
tu bat » tu ban, tu dat
tu san » thu san, tu ban, tu can
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
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 bat) or (tu san)) ky nang o lai. hieu ve cac luc van thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bat) OR (tu san)) ky nang o lai. hieu ve cac luc van thanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu bat) or (tu san)) ky nang o lai. hieu ve cac luc van thanh thai cua tre*.