Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
va thong » va phuong, he thong, va cong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sang - thanh trung ((va thong) OR (va thuong)) cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh trung ((va thong) OR (va thuong)) cong dan toan cao*".