Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien 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 lap » phan 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 quang - thinh dan vat dung cong tan ((phan tu) OR (phan lap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu quang - thinh dan vat dung cong tan ((phan tu) OR (phan lap))*".