Perhaps you should try some spelling variations:
truong cao » truong dai
chieu xanh » chieu sach, chieu sang, chieu tinh
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
hang cua » mang cua, hang ca, huong cua
tan toan » tan tran, tap toan, van toan
bai toan » bai tap

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: doi chieu xanh - hanh ((hang cua) OR (truong cao)) nhung cong ((tan toan) OR (bai toan)) cao~.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh ((hang cua) or (truong cao)) nhung cong ((tan toan) or (bai toan)) cao*.