Perhaps you should try some spelling variations:
dan nguoi » den nguoi, ban nguoi, dan nuoi
dao nguoi » cho nguoi
mach hoc » cach hoc, dich hoc, anh hoc
sach moi » sach doi, sach hoi, bach mai
hoc dao » hoc dan, hoc cao, hoc dai
su sach » so sach, vu sach
moi dan » moi dang, hoi dan, doi dan
tim » time

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

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