Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sang » chieu sang, thieu khang, thieu quang
trung tran » trung tuan, trung thanh, trung tam
tran dang » tran quang, tran hoang, tranh hang
dang cong » dung cong
hach toan » thanh toan, manh toan
tac toan » tap toan, tam toan, tich toan

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 tran dang cong ((tac toan) or (hach toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - thanh trung tran dang cong ((tac toan) OR (hach toan)) tap*.