Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
lanh sang » anh sang, lanh bang, doanh sang
cua thong » cua thuong, cua khong, cua tong
anh dang » anh dong, anh dung, anh bang
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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 - ((lanh sang) or (anh dang)) cua thong cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - ((lanh sang) OR (anh dang)) cua thong cong tac than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - ((lanh sang) or (anh dang)) cua thong cong tac than cau*.