Perhaps you should try some spelling variations:
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
cac toc » cac toi, cac nuoc, cac thoi
ta hanh » ta thanh, va hanh, tu hanh
cua tre » cua te, cuu tre, cua triet
tu can » tu cac, thu canh
tu ban » thu ban, te ban
toc ta » toc tay, toc thai
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 can) OR (tu ban)) ky ((nang cao) OR (tang ma)) hoi. hieu va cac toc ta hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu can) or (tu ban)) ky ((nang cao) or (tang ma)) hoi. hieu va cac toc ta hanh vi cua tre*.