Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
thieu sang » chieu sang, thieu khang, thieu quang
cong thanh » dong thanh, cong trinh, cong tan
hoc thieu » toc thieu, hoc hien
cong lang » cong vang, cong luong, cong quang
cong san » cong tac
khan cap » khan ap, than cap, khoan cam

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 cong thanh thang ((cong san) or (cong lang)) khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh cong thanh thang ((cong san) OR (cong lang)) khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh cong thanh thang ((cong san) or (cong lang)) khan cap*.