Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
chieu sach » chinh sach, chiet tach, chieu sang
doanh cua » doanh luan
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
kinh » dinh, minh

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) or (chieu sach)) - kinh doanh cua ((hang cong) OR (bang cong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu sach)) - kinh doanh cua ((hang cong) OR (bang cong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu sach)) - kinh doanh cua ((hang cong) OR (bang cong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu sach)) - kinh doanh cua ((hang cong) OR (bang cong)) dan than cau*.