Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
cua tre » cua te, cuu tre, cua triet
xuc van » duc van, luc van, vuc van
tu dat » tu bat
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
ve cac » va 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 dat) or (tu san)) ky nang o lai. hieu ((ve cac) OR (vien cac)) xuc van hanh 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) OR (vien cac)) xuc van hanh 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) OR (vien cac)) xuc van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu dat) or (tu san)) ky nang o lai. hieu ((ve cac) OR (vien cac)) xuc van hanh thai cua tre*.