Perhaps you should try some spelling variations:
thai thuc » thai thuy, tham thuc, thi thuc
thanh tai » thanh hai, thanh toan, doanh tai
thai tuc » thai thuy, thai hoc, thu tuc
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
sach ky » sach y, sach ty, sach kem
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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: su ((sach ky) OR (sac ky)) nang x hoi. hieu van ((thai tuc) OR (thai thuc)) va thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang x hoi. hieu van ((thai tuc) OR (thai thuc)) va thanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang x hoi. hieu van ((thai tuc) OR (thai thuc)) va thanh tai cua tre*.