Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vien cac » vien bach, vien dai, vien da
doc sach » toc sach, nuoc sach, dac sac
van dinh » van minh, van dich, va dinh
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
cac tre » cac tro, cac tru, cac trieu
va cam » va cham, va cac, va cao
nang o » nang co, nang ho, nang ro
o hoc » co hoc, mo hoc, so hoc

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: ((hoc sach) OR (doc sach)) vu nang o hoc. hieu va cam luc ((va hanh) OR (van dinh)) vien cac tre~.
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (doc sach)) vu nang o hoc. hieu va cam luc ((va hanh) or (van dinh)) vien cac tre*.