Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
thai cuu » thai cua, tai cuc, thi cuc
so sach » so sanh, bo sach, co sach
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

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