Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vat hang » van hang, dat hang, va hang
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu he » hieu ve, hiem he, hieu le
hang di » hang doi, hang vi, hang dien
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
he am » he nam, ve am
thuc » thu

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 am thuc vat hang di cua 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 am thuc vat hang di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (so sach)) ky nang xa hoi. hieu he am thuc vat hang di cua tre*.