Perhaps you should try some spelling variations:
tac nguoi » toc nguoi, thuc nguoi, tich nguoi
tay nguoi » toc nguoi, dao nguoi, lam nguoi
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
te sach » toc sach
hoc tac » hoc tach, hoc tap, hoc cac
tu mach » tu cach, tu manh, tu hach
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 tac nguoi ) OR ( tu mach hoc tay nguoi ))~.
• Adding a wildcard symbol may retrieve word variants: (( te sach hoc tac nguoi ) or ( tu mach hoc tay nguoi ))*.