Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong ban » cong bang, cong san, cong tan
phan dau » phan tu
hang dau » hang va, hang tai

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 thong cong ban ((phan dau) or (hang dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung cua thong cong ban ((phan dau) OR (hang dau)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung cua thong cong ban ((phan dau) or (hang dau))*.