Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
cam duc » cam xuc, cao duc, nam duoc
su sac » su sach, su cac, su xac
cua te » cua tu
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu ve ((cam duc) OR (pham duc)) ban thanh hai ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu ve ((cam duc) or (pham duc)) ban thanh hai ((cua tre) OR (cua te))~".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ve ((cam duc) or (pham duc)) ban thanh hai ((cua tre) OR (cua te))*.