Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
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 tra, cuu tre
te sach » toc sach
ve nam » he nam, va nam, le nam

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