Perhaps you should try some spelling variations:
sach tham » sach nha
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tham ((lang xa) or (nang ma)) hoi. hieu qua cau luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tham ((lang xa) OR (nang ma)) hoi. hieu qua cau luc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tham ((lang xa) or (nang ma)) hoi. hieu qua cau luc va hanh vai cua tre*.