Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ve » hanh ve, thanh va, thanh vien
cau treo » cau theo, cau tren, cau triet
coc thuc » hoc thuc, doc thuc, co thuc
thuc ban » thuoc ban, thuc dan, thu ban
tu sach » thu sach, su sach, te sach
vu nang » vuc nang, va nang, vu dang
hieu ve » hieu va, hieu van
sach vu » sach va, sach tu, sach uu
ve coc » ve cuoc, ve cac, ve co
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: tu sach vu nang ((x hoi) or (xa hoi)). hieu ve coc thuc ban thanh ve ((cau treo) or (cau thi))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach vu nang ((x hoi) OR (xa hoi)). hieu ve coc thuc ban thanh ve ((cau treo) OR (cau thi)).
• Adding a wildcard symbol may retrieve word variants: tu sach vu nang ((x hoi) or (xa hoi)). hieu ve coc thuc ban thanh ve ((cau treo) or (cau thi))*.