Perhaps you should try some spelling variations:
thien van » thi van
va thanh » gia thanh, ban thanh, va tinh
su sach » vu sach
so sach » so sanh, bo sach, co sach
doc hoi » duoc hoi, hoc hoi, doc hai
van bac » van ban, van bao, van hac
san chi » van chi, luan chi, toan chi
chi tre » choi tre, cho tre, chi tro
v nang » va nang, vu nang, van nang
xuc va » duc va, tuc va, luc va

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: ((su sach) OR (so sach)) v nang ((doc hoi) OR (duc dai)). thien van bac xuc va thanh san chi tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) v nang ((doc hoi) or (duc dai)). thien van bac xuc va thanh san chi tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) v nang ((doc hoi) or (duc dai)). thien van bac xuc va thanh san chi tre*.