Perhaps you should try some spelling variations:
tuan thai » xuan thai, tuan khai, tuan tai
vien cac » vien bach, vien dai, gian cac
thai cua » than cua, tai cuc, tri cua
van tuan » van quan, van ban, anh tuan
xuc van » duc van, luc van, vuc van
vien da » vien dai, hien dai
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
tu sac » tu sach, tu cac, tu bac
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 (tu san)) ky nang o lai. hieu ((vien cac) OR (vien da)) xuc van tuan thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang o lai. hieu ((vien cac) OR (vien da)) xuc van tuan thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu san)) ky nang o lai. hieu ((vien cac) OR (vien da)) xuc van tuan thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang o lai. hieu ((vien cac) OR (vien da)) xuc van tuan thai cua tre*.