Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thieu sang » chieu sang, thieu khang, thieu quang
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
tuong cua » truong cua, huong cua, thong cua
cong vang » cong lang, cong quang, cong ngang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu sang - thanh tuong cua ban ((cong vang) or (cong thanh)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh tuong cua ban ((cong vang) OR (cong thanh)) van ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh tuong cua ban ((cong vang) or (cong thanh)) van ban*.