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
cua thong » cua thuong, cua khong, cua tong
anh sang » lanh sang, anh bang, anh dang
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cap » khan cap, thanh lap, thanh cac
anh son » anh dong, tinh son

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