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
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
cong tac » cong ty
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: doi chieu sang - thanh trung va nhung ((cong dan) or (cong tac)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung va nhung ((cong dan) OR (cong tac)) toan cao.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung va nhung ((cong dan) or (cong tac)) toan cao*.