Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cuu » thai cua, tai cuc, thi cuc
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
cuu tre » cua tre, cau tren, cau treo
tu nang » tru nang, tu nong, tu nano
ve cac » va cac
o hai » co hai, so hai, o lai
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nang ((o hoc) or (o hai)). hieu ((ve cac) or (vien cac)) luoc van hanh thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nang ((o hoc) OR (o hai)). hieu ((ve cac) OR (vien cac)) luoc van hanh thai cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang ((o hoc) or (o hai)). hieu ((ve cac) or (vien cac)) luoc van hanh thai cuu tre*.