Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
thai cua » than cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
xuc van » luc van, vuc van, xuc ban
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
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.

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