Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
quoc ban » quoc bao, quoc lan, quoc quan
duoc ban » duc ban, buoc ban, duoc bat
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
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu van lam ((duoc ban) 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 (nang ma)) hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (nang ma)) hoi. hieu van lam ((duoc ban) or (quoc ban)) thanh tai cua tre*.