Perhaps you should try some spelling variations:
thanh thong » thanh thuong, thanh hong, thanh thang
chieu sang » chieu sach, chieu xanh, nhieu tang
cong thang » cong thanh, cang thang, cong thong
hieu lang » hieu quang, nhieu tang, hieu van
thong cua » thong quan, thong tu, huong cua
cong tang » cong tan, cong lang, cong vang
cua bang » chua bang, cua ban, cua dang

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) OR (hieu lang)) - thanh thong cua bang ((cong tang) or (cong thang)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - thanh thong cua bang ((cong tang) OR (cong thang)) van ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - thanh thong cua bang ((cong tang) or (cong thang)) van ban*".