Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ve cao » va cao, ve bao, ve cac
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang x hoi. hieu ve cao duc ((va hanh) or (va tinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x hoi. hieu ve cao duc ((va hanh) OR (va tinh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x hoi. hieu ve cao duc ((va hanh) or (va tinh)) di cua tre*.