Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nang may » mang may, nang ma, nang cao
quoc lan » quoc ban, nuoc luan, quoc quan
bang may » mang may, ban may, bang tay
van cham » van chat, van tham, va cham
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san

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