Perhaps you should try some spelling variations:
thanh thuong » thanh huong, thanh chuong, thanh phuong
thieu sang » chieu sang, thieu khang, thieu quang
thuong dai » thuong mai, truong dai, thuong dam
thong cong » trong cong, thong thong, phong chong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tong cong » trong cong, cong cong, dang cong
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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 thuong dai ((dung cong) or (((thong cong) OR (tong cong)))) dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh thuong dai ((dung cong) OR (((thong cong) OR (tong cong)))) dan than cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - thanh thuong dai ((dung cong) or (((thong cong) OR (tong cong)))) dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh thuong dai ((dung cong) or (((thong cong) OR (tong cong)))) dan than cao*.