Perhaps you should try some spelling variations:
thuoc mach » thuoc sach, thuong mach, thuoc ma
lam nguoi » dao nguoi, tay nguoi
cao nguoi » cho nguoi, dao nguoi, ca nguoi
doc sach » hoc sach, toc sach, nuoc sach
sach hoi » sach doi, cach thoi, hoach hoi
sach moi » sach doi, bach mai, sach bai
la nguoi » lay nguoi, ca nguoi, va nguoi
mach hoc » cach hoc, dich hoc, anh hoc
hoi lam » hoc lam, noi lam, loi lam
moi la » toi la, moi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( doc sach hoi lam nguoi ) or ( doc sach moi la nguoi ))) or ( thuoc mach hoc cao nguoi ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( doc sach hoi lam nguoi ) OR ( doc sach moi la nguoi ))) OR ( thuoc mach hoc cao nguoi )).
• Adding a wildcard symbol may retrieve word variants: (((( doc sach hoi lam nguoi ) or ( doc sach moi la nguoi ))) or ( thuoc mach hoc cao nguoi ))*.