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