Perhaps you should try some spelling variations:
dao nguoi » cho nguoi
tay nguoi » toc nguoi
gap nguoi » gian nguoi, lam nguoi, ca nguoi
sach hoi » sach doi, sach moi, cach thoi
cach hoc » cach thuc, cach thoi, dich hoc
tu sach » thu sach, su sach, te sach
co cach » co cac, co sach, ca cach
hoc gap » hoc tap, hoc lap, hoc giao

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

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