Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
cong thong » cong thuong, cong trong, dong thong
hieu lang » chieu sang, hieu quang, nhieu tang
tuong cua » truong cua, huong cua, thong cua
cong tang » cong thang, cong tan, cong lang
cua bang » chua bang, cua ban, cua dang
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - thanh tuong cua bang ((cong tang) or (cong thong)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - thanh tuong cua bang ((cong tang) OR (cong thong)) van ban*.