Perhaps you should try some spelling variations:
chinh doanh » kinh doanh
thieu sang » chieu sang, thieu khang, thieu quang
doanh cua » doanh luan
dung cong » dung trong
cong than » cong thanh, cong thang, cong tan
cua dung » cua dang, cua dong, qua dung
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van

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 - chinh doanh cua dung cong than ((phan dau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - chinh doanh cua dung cong than ((phan dau) OR (phan cac))*.