Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
cua dung » cua dang, cua dong, qua dung
tap toan » tap doan, tap quan, bai toan
ty toan » ly toan, huy toan, tam toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu xanh - thanh tuong ((cua dung) or (cua cong)) cong ((ty toan) or (tap toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - thanh tuong ((cua dung) OR (cua cong)) cong ((ty toan) OR (tap toan)) cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - thanh tuong ((cua dung) or (cua cong)) cong ((ty toan) or (tap toan)) cau*.