Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
quoc ban » quoc bao, quoc lan, quoc quan
duoc bat » duoc ban, duoc dat, duoc chat
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
van lam » van nam
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
san ky » sang ky, van ky, dan ky
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 ((nang xa) OR (nang ma)) 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 san ky ((nang xa) OR (nang ma)) hoi. hieu van lam ((duoc bat) or (quoc ban)) thanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) OR (nang ma)) hoi. hieu van lam ((duoc bat) or (quoc ban)) thanh tai cua tre*.