Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cai hoi » dai hoi, cai hoa, lai hoi
hieu ke » hieu kem, chieu ke, hieu ky
cau tuc » cau truc, cau tu, cau luc
va hanh » van hanh, va thanh, va danh
chau te » chau tho
ke cau » ket cau
tuc va » thuc va, truc va, tuc xa

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 ((cai hoi) or (cau hoi)). hieu ke cau tuc va hanh lai chau te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ((cai hoi) OR (cau hoi)). hieu ke cau tuc va hanh lai chau te.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((cai hoi) or (cau hoi)). hieu ke cau tuc va hanh lai chau te*.