Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
ho chieu » theo chieu, hoc thieu, doi chieu
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - thanh trung cua thong ((cong tan) OR (cong san)) van ban~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - thanh trung cua thong ((cong tan) OR (cong san)) van ban*.