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
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, xuc ban
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu van
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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