Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
tong cong » trong cong, cong cong, dung cong
trung va » truong va, trang va, trung ha
cong dan » cong san, cong tan, huong dan
phan cau » phan tu, phan lap, toan cau
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan van
va tong » va thong, va tuong, va trong

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 va tong cong dan ((((phan cau) OR (phan dau))) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - thanh trung va tong cong dan ((((phan cau) OR (phan dau))) OR (phan cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - thanh trung va tong cong dan ((((phan cau) OR (phan dau))) or (phan cac))".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - thanh trung va tong cong dan ((((phan cau) OR (phan dau))) or (phan cac))*.