Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
hieu quang » thieu quang, hieu quan, hieu qua
hang cong » dang cong, hang nong, thanh cong
bang cong » dang cong, bang song, dung cong
sinh cua » manh cua, dinh cuu, sinh va
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap

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 quang)) - nhan sinh cua ((hang cong) OR (bang cong)) tan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu quang)) - nhan sinh cua ((hang cong) OR (bang cong)) tan than cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu quang)) - nhan sinh cua ((hang cong) OR (bang cong)) tan than cau*.