Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien dai » hien dai
minh vai » minh va, minh hai, minh lai
minh ai » minh hai, minh lai, minh tai
luc van » luoc van, luu van, duc van
dai luc » dai luoc, dai luan, dai thuc
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, v nang, may nang

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: te sach ((y nang) OR (ly nang)) mai hoi. hieu vien dai luc van ((minh vai) OR (minh ai)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (ly nang)) mai hoi. hieu vien dai luc van ((minh vai) or (minh ai)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) OR (ly nang)) mai hoi. hieu vien dai luc van ((minh vai) or (minh ai)) cuu tre*.