Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
van tuan » van quan, van ban, anh tuan
tuan hai » tuan khai, quan hai, tran hai
thu sai » thu hai, thu tai, thu san
xuc van » duc van, luc van, vuc van
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
nang o » nang co, nang ho, nang ro
ve cac » va cac
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang o hai. hieu ((ve cac) or (vien cac)) xuc van tuan hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang o hai. hieu ((ve cac) OR (vien cac)) xuc van tuan hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang o hai. hieu ((ve cac) or (vien cac)) xuc van tuan hai cua tre*.