Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu ban » hieu van, dieu ban, lieu ban
thanh ve » hanh ve, thanh va, thanh vien
su sach » so sach, vu sach
duoc va » nuoc va, duoc ma, duong va
cuu tre » cua tre, cau tren, cau treo
ve cuu » ve cau, ve chu, ve cua
x hoi » o hoi, x ho, 5 hoi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu nang ((x hoi) or (xa hoi)). hieu ban thanh ((duoc va) OR (duc va)) thanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ((x hoi) OR (xa hoi)). hieu ban thanh ((duoc va) OR (duc va)) thanh ve cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang ((x hoi) or (xa hoi)). hieu ban thanh ((duoc va) OR (duc va)) thanh ve cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ((x hoi) or (xa hoi)). hieu ban thanh ((duoc va) OR (duc va)) thanh ve cuu tre*.