Perhaps you should try some spelling variations:
hieu nghe » lieu nghe, hiem ngheo, nhiem nghe
toc sach » hoc sach, doc sach, thuoc sach
day hang » dat hang, dai hang, day nang
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
nghe nam » nghe lam, nghiep nam, nghe nano
dang xay » dang van, van xay
hang di » hang doi, hang vi, hang dien
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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) or (so sach)) ky ((nang xa) or (dang xay)) hoi. hieu nghe nam thuc day hang di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (so sach)) ky ((nang xa) OR (dang xay)) hoi. hieu nghe nam thuc day hang di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (so sach)) ky ((nang xa) or (dang xay)) hoi. hieu nghe nam thuc day hang di cuu tre*.