Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thanh trung » thanh tung
thieu sang » chieu sang, thieu quang, hieu lang
trung tran » trung tuan, trung thanh, trung tam
tran dung » tran dang, tran hung, tran quang
dung cong » dung trong
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) OR (thieu khang)) - thanh trung tran dung cong ((tac toan) or (hach toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu khang)) - thanh trung tran dung cong ((tac toan) OR (hach toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) OR (thieu khang)) - thanh trung tran dung cong ((tac toan) or (hach toan)) tap".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) OR (thieu khang)) - thanh trung tran dung cong ((tac toan) or (hach toan)) tap*.