Perhaps you should try some spelling variations:
thanh truong » thanh trung, thanh thuong, thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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