Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cao hoi. ((hieu van) OR (hieu va)) cham duc ban hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cao hoi. ((hieu van) or (hieu va)) cham duc ban hanh vi cua tre*.