Perhaps you should try some spelling variations:
dao nguoi » cho nguoi
tay nguoi » toc nguoi
cach duoc » sach duoc, cac nuoc, cach dung
mach hoc » cach hoc, dich hoc, anh hoc
li nguoi » loi nguoi, le nguoi, ly nguoi
tu mach » tu manh, tu hach, tu sach
tu cach » tu cac
duoc li » duoc si, duoc ly, duoc lieu

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 (dao nguoi)) ) or ( tu cach duoc li nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu mach hoc ((tay nguoi) OR (dao nguoi)) ) OR ( tu cach duoc li nguoi )).
• Adding a wildcard symbol may retrieve word variants: (( tu mach hoc ((tay nguoi) or (dao nguoi)) ) or ( tu cach duoc li nguoi ))*.