Perhaps you should try some spelling variations:
hinh thai » sinh thai, tinh thai, dinh thi
hanh thai » nhanh thai, hanh tai, anh thai
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
duc ban » duc tan, duc van, dua ban
van cao » van dao, van bao, van hao
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) OR (hinh 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) OR (hinh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang xa) or (dang xay)) hoi. hieu van cao duc ban ((hanh thai) OR (hinh 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) OR (hinh thai)) cua tre*.