Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, anh trinh
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, ho chieu
canh tinh » hanh tinh, manh tinh, canh tranh
va thong » va thuong, va phuong, he thong
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat

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 - ((canh trinh) OR (canh tinh)) va thong cong tac phan tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - ((canh trinh) OR (canh tinh)) va thong cong tac phan tu".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((canh trinh) OR (canh tinh)) va thong cong tac phan tu*.