Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
xuat ban » luat ban, xuat san, thuat ban
quoc ban » quoc bao, quoc lan, quoc quan
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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 sac ky tang xa hoi. ((hieu van) OR (thien van)) cham ((xuat ban) OR (quoc ban)) hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang xa hoi. ((hieu van) OR (thien van)) cham ((xuat ban) or (quoc ban)) hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang xa hoi. ((hieu van) OR (thien van)) cham ((xuat ban) or (quoc ban)) hanh vi cua tre*.