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, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
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)) 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)) dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh thuong dai ((dung cong) or (thong cong)) dan than cao*.