Perhaps you should try some spelling variations:
nam danh » nam dinh, nam dan
cua tre » cua te, cuu tre, cua triet
xa danh » va danh, dia danh, van danh
cao hoi » cau hoi, co hoi, tao hoi
sai cua » dai cua, hai cua, lai cua
cao hoc » co hoc, cho hoc, chat hoc
hieu he » hieu ve, hiem he, hieu le
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((cao hoi) OR (cao hoc)). hieu he nam thu ((xa danh) or (nam danh)) sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((cao hoi) OR (cao hoc)). hieu he nam thu ((xa danh) OR (nam danh)) sai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((cao hoi) OR (cao hoc)). hieu he nam thu ((xa danh) or (nam danh)) sai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((cao hoi) OR (cao hoc)). hieu he nam thu ((xa danh) or (nam danh)) sai cua tre*.