Perhaps you should try some spelling variations:
tay nguoi » toc nguoi, dao nguoi, lam nguoi
sach hoi » sach doi, sach moi, cach thoi
tao mach » tao bac, tao may, tim mach
mach hoc » cach hoc, dich hoc, anh hoc
te sach » toc sach
hoi tay » hoi tai, hoi hay, hoi trac
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 hoi tay nguoi ) OR ( tao mach hoc tay nguoi ))~.
• Adding a wildcard symbol may retrieve word variants: (( te sach hoi tay nguoi ) or ( tao mach hoc tay nguoi ))*.