Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nam danh » nam dinh, nam dan
mai khoi » mai khoa, tai khoa, cac khoi
xa danh » va danh, dia danh, van danh
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
ve nam » he nam, va nam, le 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 sach ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thu ((xa danh) or (nam danh)) hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thu ((xa danh) OR (nam danh)) hai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thu ((xa danh) or (nam danh)) hai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve nam thu ((xa danh) or (nam danh)) hai cua triet*.