Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
tran dung » tran dang, tran hung, tran quang
dac thang » duc thang, bac thang, dai thang
thang ban » hang ban, tang ban, thanh ban
tan dung » tin dung, van dung, dan dung
cong dac » cong tac, cong dan, cong cac

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 ((tan dung) or (tran dung)) cong dac thang ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - thanh trung ((tan dung) OR (tran dung)) cong dac thang ban.
• Adding a wildcard symbol may retrieve word variants: toc thieu sang - thanh trung ((tan dung) or (tran dung)) cong dac thang ban*.