Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
cua thuong » cua phuong, ca thuong, cua huong
cua truong » cua trung, xuan truong, cac truong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (chiet tach)) - thanh trung ((cua thuong) OR (cua truong)) cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chiet tach)) - thanh trung ((cua thuong) OR (cua truong)) cong dan toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chiet tach)) - thanh trung ((cua thuong) OR (cua truong)) cong dan toan ban*".