Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
qua cham » qua hai, qua cac, va cham
su sach » so sach, vu sach
sac van » cac van, san van, sat van
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thuoc sach)) ty ((nang xa) or (nang x)) hoi. hieu qua cham sac van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuoc sach)) ty ((nang xa) OR (nang x)) hoi. hieu qua cham sac van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuoc sach)) ty ((nang xa) or (nang x)) hoi. hieu qua cham sac van hanh vi cua tre*.