Perhaps you should try some spelling variations:
mac nguoi » ma nguoi, tac nguoi, mat nguoi
tay nguoi » toc nguoi, dao nguoi, lam nguoi
sach hoc » sach hoi, mach hoc, sach duoc
cach hoc » cach thuc, cach thoi, dich hoc
te sach » toc sach
hoc mac » hoc ma, hoc may, hoc cac
tu cach » tu cac
hoc tay » toc tay, hoc tap, hoc may

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 hoc mac nguoi ) OR ( tu cach hoc tay nguoi ))~.
• Adding a wildcard symbol may retrieve word variants: (( te sach hoc mac nguoi ) or ( tu cach hoc tay nguoi ))*.