Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh lai » hanh lam, hanh tai, thanh lap
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach ty
tu xang » ty xang, tu lang, tu quang
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach tu xang ((ma hoi) or (xa hoi)). hieu ve cac ((luc van) or (duc van)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach tu xang ((ma hoi) OR (xa hoi)). hieu ve cac ((luc van) OR (duc van)) hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach tu xang ((ma hoi) or (xa hoi)). hieu ve cac ((luc van) or (duc van)) hanh lai cua tre*.