Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
ban hanh » ban hang
thai cua » than cua, tai cuc, tri cua
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
cua tre » cua te, cuu tre, cua triet
su hai » su tai
hai ky » thai ky, hoi ky, hai ly

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

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