Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
ban thanh » ban hang
ban hanh » ban hang
so sach » so sanh, bo sach, co sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi
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. hieu ve cham thuc ((ban thanh) OR (ban hanh)) 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. hieu ve cham thuc ((ban thanh) OR (ban hanh)) 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. hieu ve cham thuc ((ban thanh) OR (ban hanh)) ve cuu tre*".