Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hoi cua » hoi chuc
su xach » su sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hieu ve » hieu va
duc ban » duc tan, duc van, dua ban
su xac » pu xac, su cac
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: ((su xac) or (su xach)) ky tang ma hoi. ((hieu ve) or (hieu van)) cam duc ban thanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su xac) OR (su xach)) ky tang ma hoi. ((hieu ve) OR (hieu van)) cam duc ban thanh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su xac) or (su xach)) ky tang ma hoi. ((hieu ve) or (hieu van)) cam duc ban thanh hoi cua tre*.