Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
hanh lai » hanh lam, hanh tai, thanh lap
tham duc » pham duc, tham du, than duc
sach duy » sach dung, sach dao, sach dat
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
va tham » van tham, va cham, va thanh
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, 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: tu ((sach duy) or (sach duoc)) sang ((ma hoi) OR (ma hoa)). hieu va tham 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 ((ma hoi) OR (ma hoa)). hieu va tham 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 ((ma hoi) OR (ma hoa)). hieu va tham duc va hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach duy) or (sach duoc)) sang ((ma hoi) OR (ma hoa)). hieu va tham duc va hanh lai cua tre*.