Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
trung cap » truong cao, trung tam
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
thanh cap » thanh lap, hanh cap, 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: toc thieu sang - thanh trung cap ((hang cong) or (dang cong)) thuc thanh cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - thanh trung cap ((hang cong) OR (dang cong)) thuc thanh cap.
• Adding a wildcard symbol may retrieve word variants: toc thieu sang - thanh trung cap ((hang cong) or (dang cong)) thuc thanh cap*.