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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("tu cach hoc may nguoi") or ((("te mach hoc tay nguoi") OR ("te mach hoc tai nguoi"))))~.
• 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\"))))".
• Removing quotes may allow a broader search: (( 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"))))*.