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