Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh sai » dung sai, danh bat, danh dau
tu sach » thu sach, su sach, te sach
xa danh » va danh, dia danh, nam danh
hieu le » hieu ve, hieu he, hieu ly
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
le nam » ly nam, he nam, le na
thu xa » thu xac, thu ha, thu xe
ma hoi » mai hoi, ma hoa, me hoi
thiet » thieu

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