Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
bac nuoc » cac nuoc, bach tuoc, sach nuoc
va hanh » van hanh, va thanh, va danh
van bac » van ban, van bao, van hac
te sach » toc sach
luy tre » luyen tre
sach 2 » sach y
2 nang » v nang
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 2 nang ((5 hoi) OR (o hoi)). hieu van bac nuoc ((va doanh) OR (va hanh)) vi luy tre~.
• Adding a wildcard symbol may retrieve word variants: te sach 2 nang ((5 hoi) or (o hoi)). hieu van bac nuoc ((va doanh) or (va hanh)) vi luy tre*.