Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
xuc van » duc van, luc van, xuc ban
tu sac » tu sach, tu cac, tu bac
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
ve cac » vien cac
o hoi » co hoi, o hoc, o hai

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 hoi. hieu ((ve cac) or (va cac)) xuc van hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang o hoi. hieu ((ve cac) OR (va cac)) xuc van hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) OR (tu san)) ky nang o hoi. hieu ((ve cac) or (va cac)) xuc van hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) OR (tu san)) ky nang o hoi. hieu ((ve cac) or (va cac)) xuc van hanh tai cua tre*.