Perhaps you should try some spelling variations:
giap nguoi » gian nguoi, gap nguoi, giau nguoi
tay nguoi » toc nguoi, dao nguoi, lam nguoi
sach hoc » cach hoc, sach hoi, mach hoc
hoc giap » hoc giao, hoc giai, hoc gia
su sach » so sach
hoc tay » toc tay, hoc tap, hoc may
vu sach » vu bach, vu khach

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

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