Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
cua cau » cua cac, cua chu, cua cay
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
ve cua » le cua, de cua, te cua
x hoi » xa hoi, o hoi, 5 hoi

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) OR (x ho)). hieu ((le cau) OR (ke cau)) luc va hanh ve cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((x hoi) OR (x ho)). hieu ((le cau) or (ke cau)) luc va hanh ve cua cau~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((x hoi) OR (x ho)). hieu ((le cau) or (ke cau)) luc va hanh ve cua cau*.