Perhaps you should try some spelling variations:
ky tang » ky nang, ky dang, kho tang
hoc ban » hoc bang, hoc dan, hoc bai
tu cham » toc cham, thi cham
hieu tu » chieu tu, hieu tuc, hien tu
mai hoi » mai khoi, dai hoi, lai hoi
cua tre » cua te, cuu tre, cua triet
so ban » sao ban, so bang, co ban
ma hoi » xa hoi, ma hoa, me hoi
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 cac ky tang ((ma hoi) OR (mai hoi)). hieu tu cham ((so ban) OR (hoc ban)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky tang ((ma hoi) OR (mai hoi)). hieu tu cham ((so ban) or (hoc ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky tang ((ma hoi) OR (mai hoi)). hieu tu cham ((so ban) or (hoc ban)) hanh vi cua tre*.