Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham thuc » nham thuc, pham thuc, tham thuc
thanh ve » hanh ve, thanh va, thanh vien
thuc ban » thuoc ban, thuc dan, thu ban
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
so sach » so sanh, bo sach, co sach
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc
ve cuu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (te sach)) ky nang ((co hoi) OR (co loi)). hieu ve cham thuc ban thanh ve cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (te sach)) ky nang ((co hoi) OR (co loi)). hieu ve cham thuc ban thanh ve cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (te sach)) ky nang ((co hoi) OR (co loi)). hieu ve cham thuc ban thanh ve cuu tre*".