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
va thong » va thuong, va phuong, va cong
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban 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: ho chieu sang - thanh trung ((va thong) or (he thong)) cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh trung ((va thong) OR (he thong)) cong tan than cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung ((va thong) or (he thong)) cong tan than cau*.