Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
doanh vi » doanh va, doan vi, doanh vien
va doanh » van doanh, vay doanh, va danh
van bach » van bac, van hach, van sach
hieu van » hieu va, thien van, lieu va
te sach » toc sach
tuoc va » thuoc va, nuoc va, duoc va
lua tre » cua tre, luy tre, dua tren
va nang » van nang, da nang, cam nang
v nang » vu nang, van nang, voi nang
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 nang) OR (va nang)) ((5 hoi) OR (o hoi)). hieu van bach tuoc va doanh vi lua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((v nang) OR (va nang)) ((5 hoi) or (o hoi)). hieu van bach tuoc va doanh vi lua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ((v nang) OR (va nang)) ((5 hoi) or (o hoi)). hieu van bach tuoc va doanh vi lua tre*.