Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
luoc van » luoc can, luoc va, luot van
luc van » luu van, duc van, luc va
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua
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: doc sach y nang x hoi. hieu ((ve cau) OR (ke cau)) ((luc van) OR (luoc van)) hanh de cua tu~.
• Adding a wildcard symbol may retrieve word variants: doc sach y nang x hoi. hieu ((ve cau) or (ke cau)) ((luc van) or (luoc van)) hanh de cua tu*.