Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu vien » hieu hien, hieu viec, thieu nien
toc sach » hoc sach, doc sach, thuoc sach
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
luc ban » duc ban, cuc ban, luc bat
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (toc sach)) ky ((mang xa) or (nang x)) hoi. hieu vien cac luc ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky ((mang xa) OR (nang x)) hoi. hieu vien cac luc ban thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky ((mang xa) or (nang x)) hoi. hieu vien cac luc ban thanh vai cua tre*.