Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
quoc ban » quoc bao, quoc lan, quoc quan
hieu van » hieu va, thien van, lieu va
duoc bat » duoc ban, duoc dat, duoc chat
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
van lam » van nam
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky, sai ky
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 xa) OR (lang xa)) hoi. hieu van lam ((duoc bat) OR (quoc ban)) thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (lang xa)) hoi. hieu van lam ((duoc bat) or (quoc ban)) thanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (lang xa)) hoi. hieu van lam ((duoc bat) or (quoc ban)) thanh tai cua tre*.