Perhaps you should try some spelling variations:
"tu cach hoc may nguoi" » "tu cach hoc tay nguoi", "tu cach hoc ma nguoi", "tu cach hoc lay nguoi", "tu cach thuc may nguoi", "tu cach thoi may nguoi", "tu dich hoc may nguoi", "tu cac hoc may nguoi"
"ke mach hoc toc nguoi" » "ke mach hoc con nguoi", "ke dich hoc toc nguoi", "ke anh hoc toc nguoi", "ke bac hoc toc nguoi", "ke hoach hoc toc nguoi", "ke mach hoc hoc nguoi", "ke mach hoc thuoc nguoi", "ke mach hoc toeic nguoi"
"te mach hoc cho nguoi" » "te mach hoc cua nguoi", "te dich hoc cho nguoi", "te anh hoc cho nguoi", "te bac hoc cho nguoi", "te sach hoc cho nguoi", "tim mach hoc cho nguoi", "tao mach hoc cho nguoi", "te mach hoc cao nguoi", "te mach hoc pho nguoi", "te mach hoc co nguoi"

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 ((("ke mach hoc toc nguoi") OR ("te mach hoc cho nguoi"))))~.
• Removing quotes may allow a broader search: (( tu cach hoc may nguoi ) or ((( ke mach hoc toc nguoi ) or ( te mach hoc cho nguoi ))))~.
• Adding a wildcard symbol may retrieve word variants: (("tu cach hoc may nguoi") or ((("ke mach hoc toc nguoi") or ("te mach hoc cho nguoi"))))*.