Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
phan duc » pham duc, phan tu, phan dau
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
va hanh » van hanh, va thanh, va danh
co hoi » co hoc, co loi
co hai » co dai, o hai, so hai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang ((co hoi) or (co hai)). hieu ve phan duc va hanh vi ((cua te) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((co hoi) OR (co hai)). hieu ve phan duc va hanh vi ((cua te) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((co hoi) or (co hai)). hieu ve phan duc va hanh vi ((cua te) or (cau tren))*.