Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
dai khoang » da khoang, dai khong, tao khoang
doi chieu » doc hieu, doi chi, ho chieu
dai khung » dai khong, dam khung, mai hung
cong tan » cong tac, cong san, cong thanh
tran ban » tranh ban, tran van, tran bai
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - thanh trung ((dai khung) OR (dai khoang)) cong tan ((tran ban) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu xanh - thanh trung ((dai khung) OR (dai khoang)) cong tan ((tran ban) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - thanh trung ((dai khung) OR (dai khoang)) cong tan ((tran ban) or (toan ban))*.