Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
luong cong » dung cong, trong cong, cong cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
doanh bac » doanh bat, doanh ban, danh bac
doanh van » doan van, doanh va, doanh ban
cong tac » cong ty
chat » nhat, phat

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 - hanh tinh chat luong cong tac ((doanh bac) or (doanh van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu sang - hanh tinh chat luong cong tac ((doanh bac) OR (doanh van)).
• Adding a wildcard symbol may retrieve word variants: toc thieu sang - hanh tinh chat luong cong tac ((doanh bac) or (doanh van))*.