Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
tu dat » tu bat
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 dat) or (tu san)) ky nang o lai. hieu ve cac ((xuc van) OR (duc van)) thanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu dat) OR (tu san)) ky nang o lai. hieu ve cac ((xuc van) OR (duc van)) thanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu dat) or (tu san)) ky nang o lai. hieu ve cac ((xuc van) OR (duc van)) thanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu dat) or (tu san)) ky nang o lai. hieu ve cac ((xuc van) OR (duc van)) thanh thai cua tre*.