Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
le cau » le mau, le cap
ke cau » ket cau
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((le cau) OR (ke cau)) luc va hanh vi cua cu~.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((le cau) or (ke cau)) luc va hanh vi cua cu*.