Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
hanh trinh » canh tranh, hanh chinh
doi chieu » doc hieu, doi chi, ho chieu
chua bang » chu bang, chua xang, thuat bang
chua nang » chuc nang, chua xang, kha nang
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cau » phan dau, phan cac, phan tu

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) or (hanh trinh)) ((chua bang) or (chua nang)) cong san phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((thanh trung) OR (hanh trinh)) ((chua bang) OR (chua nang)) cong san phan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((thanh trung) or (hanh trinh)) ((chua bang) or (chua nang)) cong san phan cau*.