Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
quoc lan » quoc ban, nuoc luan, quoc quan
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
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 san ky tang ma hoi. hieu van cham ((xuc ban) OR (quoc lan)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu san ky tang ma hoi. hieu van cham ((xuc ban) or (quoc lan)) hanh vi cua tre*.