Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
may thoi » gay thoi, may thi, tay thoi
ke mang » ke nang, ke trang
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac
su xac » pu xac, su cac
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: ((su sac) OR (su xac)) ke mang may thoi. hieu va cam duc ban thanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) OR (su xac)) ke mang may thoi. hieu va cam duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) OR (su xac)) ke mang may thoi. hieu va cam duc ban thanh dai cua tre*.