Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thinh doan » chinh doanh, hinh toan, thi doan
dung cong » dung trong
cong than » cong thanh, cong thang, cong tan
doan vat » doan va, doan van, dan vat
vat dung » van dung, va dung, viet dung
phan lap » phan dau

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 khang - thinh doan vat dung cong than ((phan tu) or (phan lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu khang - thinh doan vat dung cong than ((phan tu) OR (phan lap))*.