Perhaps you should try some spelling variations:
may nguoi » ma nguoi, lay nguoi, mac nguoi
tay nguoi » toc nguoi, dao nguoi
tai nguoi » tac nguoi, loai nguoi, phai nguoi
cach hoc » cach thuc, cach thoi, dich hoc
mach hoc » dich hoc, anh hoc, bac hoc
tu cach » tu cac
hoc may » hoc ma
te mach » ke mach, te sach, tim mach
hoc tay » toc tay, hoc tap, hoc tan
hoc tai » hoc dai, hoc tap, hoc bai

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: (( tu cach hoc may nguoi ) OR ((( te mach hoc tay nguoi ) OR ( te mach hoc tai nguoi ))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu cach hoc may nguoi ) or ((( te mach hoc tay nguoi ) OR ( te mach hoc tai nguoi ))))~".
• Adding a wildcard symbol may retrieve word variants: (( tu cach hoc may nguoi ) or ((( te mach hoc tay nguoi ) OR ( te mach hoc tai nguoi ))))*.