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