Perhaps you should try some spelling variations:
cham duc » cham soc, pham duy, phan duc
hanh lai » hanh lam, hanh tai, thanh lap
sach ky » sac ky, sach ty, sach kem
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet

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

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