Perhaps you should try some spelling variations:
hang duong » hoang duong, han duong, tang duong
thieu sang » chieu sang, thieu khang, thieu quang
hang luong » nang luong, hang thuong, hoang vuong
hieu lang » chieu sang, hieu quang, nhieu tang
tinh sinh » tinh ninh, tinh binh, tinh hinh
manh toan » thanh toan, anh tuan, tinh 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) or (hieu lang)) - tinh sinh vat ((hang duong) OR (hang luong)) manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (hieu lang)) - tinh sinh vat ((hang duong) OR (hang luong)) manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (hieu lang)) - tinh sinh vat ((hang duong) OR (hang luong)) manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (hieu lang)) - tinh sinh vat ((hang duong) OR (hang luong)) manh toan ban*.