Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
cua thuong » cua phuong, ca thuong, cua huong
cua truong » cua trung, xuan truong, cac truong
hoc thieu » toc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
chan ban » can ban, chat ban, chan nan

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 trung ((cua thuong) or (cua truong)) ((cong dan) or (cong tac)) chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - thanh trung ((cua thuong) OR (cua truong)) ((cong dan) OR (cong tac)) chan ban.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - thanh trung ((cua thuong) or (cua truong)) ((cong dan) or (cong tac)) chan ban*.