Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
ho chieu » theo chieu, hoc thieu, doi chieu
trung he » trung ha, trong he, trung hieu
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - thanh trung he thong ((cong tan) or (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh trung he thong ((cong tan) OR (cong san)) toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung he thong ((cong tan) or (cong san)) toan cao*.