Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
sach ky » sac ky, sach ty, sach kem
hoi cuu » hoi chu, hoi cua, ho cuu
cuu tre » cua tre, cau tren, cau treo
van am » van nam, van lam, van dam
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) or (sach y)) nang x hoi. hieu van am thuc day thanh hoi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) nang x hoi. hieu van am thuc day thanh hoi cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) nang x hoi. hieu van am thuc day thanh hoi cuu tre*.