Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
co sach » bo sach, cuon sach, hoc sach
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
cau tre » cau tren, cau treo, cau tra
he nam » ha nam, nghe nam
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (co sach)) ky nang xa hoi. hieu he nam thuc va hang di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (co sach)) ky nang xa hoi. hieu he nam thuc va hang di cau tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (co sach)) ky nang xa hoi. hieu he nam thuc va hang di cau tre*.