Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
danh dai » danh dau, danh di, danh sai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac nuoc
cac tac » cac toc, cac bac, cac dac
xa danh » va danh, dia danh, nam danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky sang mai hoi. hieu ve ((cac tuc) or (cac tac)) xa danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang mai hoi. hieu ve ((cac tuc) OR (cac tac)) xa danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky sang mai hoi. hieu ve ((cac tuc) or (cac tac)) xa danh dai cua tre*.