Perhaps you should try some spelling variations:
tap nguoi » gap nguoi, tac nguoi, giap nguoi
tay nguoi » toc nguoi, dao nguoi
hach duoc » hanh duoc, sach duoc, hoc duoc
doi nguoi » moi nguoi, cuoi nguoi, con nguoi
mach hoc » cach hoc, dich hoc, anh hoc
duoc doi » cuoc doi, duoc hoi, luoc doi
tu mach » tu cach, tu manh, tu sach
hoc tay » toc tay, hoc tap, hoc may
cac thu » cach thuc, cac thoi
thu tap » thu thap, thuc tap, thu tai
tu hach » tu hanh, tu cach, tu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( tu mach hoc tay nguoi ) or ( tu cac thu tap nguoi ))) or ( tu hach duoc doi nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu mach hoc tay nguoi ) OR ( tu cac thu tap nguoi ))) OR ( tu hach duoc doi nguoi )).
• Adding a wildcard symbol may retrieve word variants: (((( tu mach hoc tay nguoi ) or ( tu cac thu tap nguoi ))) or ( tu hach duoc doi nguoi ))*.