Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thieu sang » chieu sang, thieu khang, thieu quang
canh doanh » hanh doanh, chinh doanh, kinh doanh
hoc thieu » toc thieu, hoc hien
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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 - ((canh doanh) or (doanh doanh)) ((cua dung) OR (qua dung)) cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - ((canh doanh) OR (doanh doanh)) ((cua dung) OR (qua dung)) cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu sang - ((canh doanh) or (doanh doanh)) ((cua dung) OR (qua dung)) cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - ((canh doanh) or (doanh doanh)) ((cua dung) OR (qua dung)) cong san toan ban*.