Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ky sang » ky nang, ky dang, ky tang
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky sang ((ma hoi) or (xa hoi)). hieu van cam duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky sang ((ma hoi) OR (xa hoi)). hieu van cam duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang ((ma hoi) or (xa hoi)). hieu van cam duc va hanh vi cua tre*.