Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van khanh » van thanh, van hanh, van anh
khanh tai » thanh tai, hanh tai, nhanh thai
vien cac » vien bach, vien dai, vien da
tu sach » thu sach, su sach, te sach
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, vuc van
cuc tre » duc tre, cua tre, cuu tre
y nang » ky nang, ly nang, v nang
co hai » co dai, co hoi, o hai
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 y nang ((o hoc) or (co hai)). hieu vien cac xuc van khanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((o hoc) OR (co hai)). hieu vien cac xuc van khanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((o hoc) or (co hai)). hieu vien cac xuc van khanh tai cuc tre*.