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
chua dong » ha dong, huy dong, hoa dong
cua dong » cua cong, cua dang, cua nong
tung dan » dung dan, huong dan, trung dai
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 ((cua dong) or (chua dong)) tung dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung ((cua dong) OR (chua dong)) tung dan than cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung ((cua dong) or (chua dong)) tung dan than cau*.