Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
cham hoi » cham voi, cham h'roi, pham hoai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
may hoi » may thoi, tay hoi, may hmi
ty mang » ty xang, ty hang, tin mang
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty mang ((may hoi) or (mai hoi)). hieu ve ((cham hoi) or (cam lo)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty mang ((may hoi) OR (mai hoi)). hieu ve ((cham hoi) OR (cam lo)) va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty mang ((may hoi) or (mai hoi)). hieu ve ((cham hoi) or (cam lo)) va hanh vai cua tre*.