Perhaps you should try some spelling variations:
thuoc mach » thuoc sach, thuong mach, thuoc ma
thap nguoi » thanh nguoi, thang nguoi, thuat nguoi
tay nguoi » toc nguoi, dao nguoi
mach hoc » cach hoc, dich hoc, anh hoc
thu thap » thu nhap, thuc thai, thu thuat
hoc tay » toc tay, hoc may, hoc tap
sao cac » sat cac, tao cac
cac thu » cac thuat, cach thuc, cac thoi

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

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