Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
chieu xanh » chieu sach, chieu sang, chieu tinh
tinh tinh » trinh tinh, tinh ninh, tinh binh
bang cong » bang song, hang cong, dung cong
dang cong » dung cong
tinh vat » trinh vat, sinh vat, tinh va
san toan » van toan, dan toan, manh 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 (chieu xanh)) - tinh tinh vat ((bang cong) OR (dang cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu sang) OR (chieu xanh)) - tinh tinh vat ((bang cong) OR (dang cong)) san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sang) or (chieu xanh)) - tinh tinh vat ((bang cong) OR (dang cong)) san toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sang) or (chieu xanh)) - tinh tinh vat ((bang cong) OR (dang cong)) san toan ban*.