Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hang cong » dang cong, hang nong, bang cong
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, xuan toan
sinh va » sinh vat, tinh va, dinh van
luat » luan, xuat

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 xanh - hanh ((trinh luat) OR (sinh va)) hang cong ((dan toan) OR (manh toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - hanh ((trinh luat) or (sinh va)) hang cong ((dan toan) OR (manh toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh ((trinh luat) or (sinh va)) hang cong ((dan toan) OR (manh toan)) tap*.