Perhaps you should try some spelling variations:
quan trong » gian trong
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
canh ban » can ban, canh van, doanh ban
canh dan » canh van, sanh dan, thanh dan
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu xanh - ((canh ban) or (canh dan)) quan trong cong ((san toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - ((canh ban) OR (canh dan)) quan trong cong ((san toan) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - ((canh ban) or (canh dan)) quan trong cong ((san toan) or (van toan)) cau*.