Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
dang xa » lang xa, dang ha, dang va
cua tre » cuu tre, cua triet, dua tren
cao duc » dao duc, cao suc, giao duc
su sai » su tai, su hai, su dai
ve cao » va cao, ve bao, ve cac
sai ky » sac ky
cua te » cua tu

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 ve cao duc van hanh thai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang xa) OR (dang xay)) hoi. hieu ve cao duc van hanh thai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang xa) or (dang xay)) hoi. hieu ve cao duc van hanh thai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((dang xa) or (dang xay)) hoi. hieu ve cao duc van hanh thai ((cua tre) OR (cua te))*.