Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
cham o » cham soc
y tang » ky tang, 6 tang, 7 tang
cam lo » nam lo, cam ly, cam o
cam ky » cao ky, cac ky
ma hoi » mai hoi, xa hoi, ma hoa

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 y tang ma hoi. hieu ve ((cham o) or (((cam lo) or (cam ky)))) va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y tang ma hoi. hieu ve ((cham o) OR (((cam lo) OR (cam ky)))) va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y tang ma hoi. hieu ve ((cham o) or (((cam lo) or (cam ky)))) va hanh lai cua tre*.