Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
ban hanh » ban hang
dang xay » dang van, van xay
duc ban » duc tan, duc van, dua ban
cao duc » dao duc, cao suc, giao duc
van cao » van dao, van bao, van hao
cua tre » cua te, cuu tre, cua triet
dang xa » lang xa, dang ha, dang va
sai ky » sac ky
su sai » su tai, su hai, su dai

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

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