Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
hieu ve » hieu van
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
tu san » thu san, tu ban, tu can
nang o » nang co, nang ho, nang ro
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 cac) or (tu san)) ky nang o lai. ((hieu ve) or (hieu va)) cam xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cac) OR (tu san)) ky nang o lai. ((hieu ve) OR (hieu va)) cam xuc van hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cac) or (tu san)) ky nang o lai. ((hieu ve) or (hieu va)) cam xuc van hanh tai cua tre*.