Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
thanh tung » thanh cong
ho chieu » theo chieu, hoc thieu, doi chieu
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - ((thanh trung) OR (thanh tung)) cua dung ((cong tan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - ((thanh trung) or (thanh tung)) cua dung ((cong tan) OR (cong san)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - ((thanh trung) or (thanh tung)) cua dung ((cong tan) OR (cong san)) toan cao*.