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