Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
bang cong » dang cong, bang song, hang cong
trung ha » trung hoc, trung tam, trung cap
cong san » cong tac
than cau » toan cau, phan cau, than cap
khan cap » khan ap, than cap, khoan cam
ha bang » hai bang, ha tang, va bang

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 sang - thanh trung ha bang cong san ((than cau) or (khan cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung ha bang cong san ((than cau) OR (khan cap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung ha bang cong san ((than cau) or (khan cap))*.