Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
hanh lai » hanh lam, hanh tai, thanh lap
cham duc » pham duc, cham soc, pham duy
sach duy » sach dung, sach dao, sach dat
ve cham » va cham, ve chat, vu cham
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach duy) OR (sach duoc)) sang ((mai hoi) or (ma hoa)). hieu ve cham duc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach duy) OR (sach duoc)) sang ((mai hoi) OR (ma hoa)). hieu ve cham duc va hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach duy) OR (sach duoc)) sang ((mai hoi) or (ma hoa)). hieu ve cham duc va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach duy) OR (sach duoc)) sang ((mai hoi) or (ma hoa)). hieu ve cham duc va hanh lai cua tre*.