Perhaps you should try some spelling variations:
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
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 sac ky nang ((ma hoi) or (mai hoi)). hieu va cam duc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (mai hoi)). hieu va cam duc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (mai hoi)). hieu va cam duc va hanh vi cua tre*.