Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thanh ve » thanh va, thanh vien, thanh van
thuc ban » thuoc ban, thuc dan, thu ban
so sach » so sanh, bo sach, co sach
hanh ve » hanh vi, hanh va, hanh kem
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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