Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
thieu sang » chieu sang, thieu quang, hieu lang
canh doanh » hanh doanh, chinh doanh, doanh doanh
cong quang » luong quang, thong quang, duong quang
quang phan » quang chan, quang phat, quang thanh
dung cong » dung trong
doanh va » doan va, doanh tai, doanh cua
phan dau » phan tu, hang dau
va dung » van dung, va duong, vat dung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu sang) OR (thieu khang)) - canh doanh va dung cong quang phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) OR (thieu khang)) - canh doanh va dung cong quang phan dau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) OR (thieu khang)) - canh doanh va dung cong quang phan dau*.