Perhaps you should try some spelling variations:
loai nguoi » loi nguoi, hoa nguoi, moi nguoi
lap nguoi » lam nguoi, gap nguoi, lay nguoi
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
hoc loai » hoc ngoai, hoc dai, so loai
so mach » so sach, tao mach, kon mach
hoc lap » hoc tap, hoc lam, doc lap

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

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