Perhaps you should try some spelling variations:
may nguoi » tay nguoi, ma nguoi, lay nguoi
toc nguoi » con nguoi
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
tu sach » thu sach, su sach, te sach
hoc may » hoc ma
tu mach » tu cach, tu manh, tu hach
hoc toc » hoc hoc, hoc thuoc, hoc toeic

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu sach hoc may nguoi ) OR ( tu mach hoc toc nguoi ))~".
• Adding a wildcard symbol may retrieve word variants: (( tu sach hoc may nguoi ) OR ( tu mach hoc toc nguoi ))*.