Perhaps you should try some spelling variations:
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
xuc ban » duc ban, cuc ban, xuat ban
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
san ky » sang ky, van ky, dan ky
vi cua » vai cua, di cua
tu san » thu san, tu ban, tu can

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 ((sang ma) OR (nang ma)) hoi. hieu ve cham ((xuc ban) OR (quoc ban)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((sang ma) or (nang ma)) hoi. hieu ve cham ((xuc ban) OR (quoc ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang ma) or (nang ma)) hoi. hieu ve cham ((xuc ban) OR (quoc ban)) hanh vi cua tre*.