Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
doanh vi » doanh va, doan vi, doanh vien
luoc van » luoc can, luoc va, luc van
cac luoc » cac nuoc, cac cuoc, cac quoc
luy tre » luyen tre
sach va » sach xa, sach ha, sach dao
sach v » sach y, sach 2, sach vay
vi luy » vi lua, vi luu
o hoi » co hoi, o hoc, o hai

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: te ((sach v) OR (sach va)) nang ((5 hoi) OR (o hoi)). lieu va cac luoc van doanh vi luy tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) OR (sach va)) nang ((5 hoi) or (o hoi)). lieu va cac luoc van doanh vi luy tre~".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) OR (sach va)) nang ((5 hoi) or (o hoi)). lieu va cac luoc van doanh vi luy tre*.