Perhaps you should try some spelling variations:
thong quang » thong quan, thong qua, luong quang
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
truong cua » truong ca, truong quan, truong cao
dung cong » dung trong
tap toan » tap doan, tap quan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - thanh ((truong cua) or (thong quang)) dung cong ((tap toan) OR (bai toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - thanh ((truong cua) OR (thong quang)) dung cong ((tap toan) OR (bai toan)) cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - thanh ((truong cua) or (thong quang)) dung cong ((tap toan) OR (bai toan)) cao*".