Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
thanh chan » thanh phan, thanh nhan, thanh cha
hay khong » bay khong, hang khong, hoac khong
hua khong » hoa khong, cua khong, hoac khong
ho chieu » theo chieu, hoc thieu, doi chieu
chan cau » phan cau, can cau, chinh cau

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 ((hay khong) or (hua khong)) cong thanh chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh trung ((hay khong) OR (hua khong)) cong thanh chan cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung ((hay khong) or (hua khong)) cong thanh chan cau*.