Perhaps you should try some spelling variations:
"toc mach hoc lam nguoi" » "toc mach hoc dao nguoi", "toc mach hoc tay nguoi", "toc sach hoc lam nguoi", "hoc mac hoc lam nguoi", "tim mach hoc lam nguoi", "toc cach hoc lam nguoi", "toc dich hoc lam nguoi", "toc anh hoc lam nguoi", "toc mach duoc lam nguoi"
"tu cach thoi sao nguoi" » "tu cac thoi sao nguoi", "tu cach thuc sao nguoi", "tu cach noi sao nguoi", "tu cach thoi dao nguoi", "tu cach thoi cho nguoi", "tu cach thoi o nguoi", "tu cach thi sao nguoi", "tu cach thoi dai nguoi"
"ve hinh hoc dan nguoi" » "ve hinh hoc dao nguoi", "ve hinh hoc den nguoi", "ve hinh hoc ban nguoi", "ve sinh hoc dan nguoi", "ve tin hoc dan nguoi", "ve benh hoc dan nguoi", "ve chinh hoc dan nguoi", "ve tinh hoc dan nguoi"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("toc mach hoc lam nguoi") or ((("tu cach thoi sao nguoi") or ("ve hinh hoc dan nguoi"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("toc mach hoc lam nguoi") OR ((("tu cach thoi sao nguoi") OR ("ve hinh hoc dan nguoi"))))*.
• Removing quotes may allow a broader search: (( toc mach hoc lam nguoi ) or ((( tu cach thoi sao nguoi ) or ( ve hinh hoc dan nguoi ))))*.