Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
duy ban » duy van, duy can, dua ban
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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 (dai hoi)). hieu ve pham ((duy ban) or (uy ban)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((ma hoi) OR (dai hoi)). hieu ve pham ((duy ban) OR (uy ban)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((ma hoi) or (dai hoi)). hieu ve pham ((duy ban) or (uy ban)) hanh vi cua tre*.