Perhaps you should try some spelling variations:
quang dien » quan dien, luong dien, quan den
hang dien » dang dieu, nhan dien, sang dieu
toc sach » hoc sach, doc sach, thuoc sach
so sach » so sanh, bo sach, co sach
hieu he » hieu ve, hiem he, hieu le
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho
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 x hoi. hieu he am thuc vat ((hang dien) OR (quang dien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (so sach)) ky nang x hoi. hieu he am thuc vat ((hang dien) OR (quang dien)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (so sach)) ky nang x hoi. hieu he am thuc vat ((hang dien) OR (quang dien)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (so sach)) ky nang x hoi. hieu he am thuc vat ((hang dien) OR (quang dien)) cua tre*.