Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
dai hoi » dai hoc, dai hai
dai moi » doi moi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
san cau » van cau, ban cau, can cau
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((dai hoi) or (dai moi)). hieu va cam duc ban thanh san cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((dai hoi) OR (dai moi)). hieu va cam duc ban thanh san cau tren.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((dai hoi) or (dai moi)). hieu va cam duc ban thanh san cau tren*.