Perhaps you should try some spelling variations:
thanh chuong » thanh huong, thanh cong, nhanh chong
chieu sang » chieu sach, chieu xanh, nhieu tang
chuong qua » chuong chua, duong qua, thong qua
hieu lang » hieu quang, nhieu tang, hieu van
qua nhung » quan nhung, cua nhung, qua chung
cong tang » cong thang, cong lang, cong vang
cong tan » cong tac, cong san, cong thanh

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

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