Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, dua tren
duc van » duc va, duc tan, duc manh
cao duc » dao duc, cao suc, giao duc
hieu ve » hieu va, hieu van
dang ha » dong ha, lang ha, tang ha
dung ha » dung va, dung he, dung khoa
sai ky » sac ky
ve cao » va cao, ve bao, ve cac
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 ha) OR (dung ha)) hoi. hieu ve cao duc van hanh thai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky ((dang ha) OR (dung ha)) hoi. hieu ve cao duc van hanh thai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((dang ha) OR (dung ha)) hoi. hieu ve cao duc van hanh thai ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sai ky ((dang ha) OR (dung ha)) hoi. hieu ve cao duc van hanh thai ((cua tre) or (cua triet))*.