Perhaps you should try some spelling variations:
nam danh » nam dinh, nam dan
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
doi cua » dai cua, hoi cua
xa danh » va danh, dia danh, van danh
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ((ma hoi) or (lai hoi)). hieu ve cac toc ((xa danh) or (nam danh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((ma hoi) OR (lai hoi)). hieu ve cac toc ((xa danh) OR (nam danh)) doi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((ma hoi) or (lai hoi)). hieu ve cac toc ((xa danh) or (nam danh)) doi cua tre*.