Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » hoc sach, doc sach, thuoc sach
minh vai » minh va, minh hai, minh ai
vien dai » hien dai
vai cuu » vai cua
xuc van » duc van, luc van, vuc van
dai xuc » dai xu, dai luoc, dai thuc
mai hoi » mai khoi, dai hoi, lai hoi
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ((ly nang) or (ly vang)) mai hoi. hieu vien dai xuc van minh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((ly nang) OR (ly vang)) mai hoi. hieu vien dai xuc van minh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((ly nang) or (ly vang)) mai hoi. hieu vien dai xuc van minh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ((ly nang) or (ly vang)) mai hoi. hieu vien dai xuc van minh vai cuu tre*.