Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang doi » hang loi, huong doi, hang tai
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
so sach » so sanh, bo sach, co sach
hang di » hang vi, hang dien, hang dich
cuu tre » cua tre, cau tren, cau treo
he nam » ha nam, nghe nam

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 hoi. hieu he nam thuc day ((hang di) OR (hang doi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (so sach)) ky nang xa hoi. hieu he nam thuc day ((hang di) OR (hang doi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (so sach)) ky nang xa hoi. hieu he nam thuc day ((hang di) OR (hang doi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (so sach)) ky nang xa hoi. hieu he nam thuc day ((hang di) OR (hang doi)) cuu tre*.