Perhaps you should try some spelling variations:
dao nguoi » cho nguoi
tay nguoi » toc nguoi
cach duoc » sach duoc, cac nuoc, cach dung
loi nguoi » loai nguoi, moi nguoi, doi nguoi
hach hoc » cach hoc, mach hoc, hoach hoi
duoc loi » duoc li, duc loi, duoc hoi
tu hach » tu hanh, tu sach, vu khach
tu cach » tu cac

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

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