Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
khong cong » thong cong, chong cong, khong con
khong cang » thong cong, hong bang, khong dung
trung cua » truong cua, trung tuan, trung cap
ho chieu » theo chieu, hoc thieu, doi chieu
van phan » van phong, van thanh, luan phan

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