Perhaps you should try some spelling variations:
"su cach hoc tay nguoi" » "su cach hoc toc nguoi", "su cach thoi tay nguoi", "su dich hoc tay nguoi", "su cac hop tay nguoi", "tu cach hoc tay nguoi", "su cac hoc tay nguoi", "cuu cach hoc tay nguoi", "su cach toc tay nguoi", "su cach hoc tap nguoi", "su cach hoc may nguoi"
"su cach thuc dao nguoi" » "su anh thuc dao nguoi", "su cac thu dao nguoi", "su cach thuc cho nguoi", "su cach thuc dan nguoi", "su cach thuc day nguoi", "su cach chuc dao nguoi", "tu cach thuc dao nguoi", "su cac thuc dao nguoi", "cuu cach thuc dao nguoi"
"su sach hoc lam nguoi" » "su sach hoi lam nguoi", "su mach hoc lam nguoi", "su sach duoc lam nguoi", "so sach hoc lam nguoi", "vu sach hoc lam 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: (("su sach hoc lam nguoi") or ((("su cach hoc tay nguoi") or ("su cach thuc dao nguoi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("su sach hoc lam nguoi") OR ((("su cach hoc tay nguoi") OR ("su cach thuc dao nguoi")))).
• Removing quotes may allow a broader search: (( su sach hoc lam nguoi ) or ((( su cach hoc tay nguoi ) or ( su cach thuc dao nguoi )))).
• Adding a wildcard symbol may retrieve word variants: (("su sach hoc lam nguoi") or ((("su cach hoc tay nguoi") or ("su cach thuc dao nguoi"))))*.