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

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 xa) OR (nang x)) hoi. hieu van nam 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 xa) OR (nang x)) hoi. hieu van nam thuc day thanh hoi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) or (sach y)) ((nang xa) OR (nang x)) hoi. hieu van nam thuc day thanh hoi cuu tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) or (sach y)) ((nang xa) OR (nang x)) hoi. hieu van nam thuc day thanh hoi cuu tre*.