Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » thien van, lieu va, hieu ve
lam duoc » nam duoc, luat duoc, lam thuoc
duoc ban » duc ban, quoc ban, buoc ban
thai cua » tai cuc, tri cua, dai cua
than cua » nhan cua, ban cua, gian cua
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
tu bai » tu ban, tu bat, te bai
bai ky » ban ky, sai ky, bac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu bai ky nang xa hoi. ((hieu van) or (hieu va)) lam duoc ban thanh ((thai cua) or (than cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky nang xa hoi. ((hieu van) OR (hieu va)) lam duoc ban thanh ((thai cua) OR (than cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu bai ky nang xa hoi. ((hieu van) or (hieu va)) lam duoc ban thanh ((thai cua) or (than cua)) tre*.