Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, hieu lang
doanh cua » doanh luan
cua nhung » va nhung
danh toan » manh toan, anh toan, dang toan
hieu van » hieu va, thien van, lieu va
dan toan » van toan, dan than, manh toan

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) OR (hieu van)) - toan doanh cua nhung cong ((danh toan) OR (dan toan)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu van)) - toan doanh cua nhung cong ((danh toan) OR (dan toan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - toan doanh cua nhung cong ((danh toan) OR (dan toan)) cao*.