Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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 nang ((dai hoi) or (cau hoi)). hieu ve cac luc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((dai hoi) OR (cau hoi)). hieu ve cac luc va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((dai hoi) or (cau hoi)). hieu ve cac luc va hanh lai cua tre*.