Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
ke cau » ket cau
ve cua » le cua, de cua, te cua
luc va » duc va, tuc va, loc va
cua cu » cua chu, cua cau, cua su
y nang » ky nang, ly nang, v nang
le cau » le mau, le cap
x hoi » o hoi, x ho, 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 (xa hoi)). hieu ((le cau) OR (ke cau)) luc va hanh ve cua cu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ((x hoi) OR (xa hoi)). hieu ((le cau) or (ke cau)) luc va hanh ve cua cu~".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ((x hoi) OR (xa hoi)). hieu ((le cau) or (ke cau)) luc va hanh ve cua cu*.