Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thinh dan » thinh doan, trinh dan, hinh dan
dung cong » dung trong
vat dung » van dung, va dung, viet dung
cong tan » cong tac, cong san, cong thanh
phan dau » phan tu, hang dau
dan vat » dang vat, van vat, dan va

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