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

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