Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
danh sai » dung sai, danh bat, danh dau
xa danh » va danh, dia danh, nam danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ha » hieu hoa, hieu va, hieu ca
thu xa » thu xac, thu ha, thu xe
ma hoi » xa hoi, ma hoa, me hoi

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 ((ma hoi) or (mai hoi)). hieu ha nam thu xa danh sai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu ha nam thu xa danh sai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) or (mai hoi)). hieu ha nam thu xa danh sai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (mai hoi)). hieu ha nam thu xa danh sai ((cua triet) OR (su triet))*.