Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh luan, trinh phan
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh quan » tinh quang, trinh luat, trinh han
bang cong » dang cong, bang song, hang cong
cong san » cong tac
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: ho ((chieu xanh) or (trieu tinh)) - canh ((trinh chuan) OR (trinh quan)) bang cong san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (trieu tinh)) - canh ((trinh chuan) OR (trinh quan)) bang cong san toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (trieu tinh)) - canh ((trinh chuan) OR (trinh quan)) bang cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (trieu tinh)) - canh ((trinh chuan) OR (trinh quan)) bang cong san toan ban*.