Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
dung hoc » dong hoc, dung thuoc, trung hoc
cong ban » cong bang, cong san, cong tan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
tung ho » tuong ho, trung hoc, trung hoa

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 ((tung ho) or (dung hoc)) thuong cong ban ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - thanh ((tung ho) OR (dung hoc)) thuong cong ban ((toan cau) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - thanh ((tung ho) or (dung hoc)) thuong cong ban ((toan cau) or (toan cao))*.