Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
canh trinh » canh tranh, hanh trinh, anh trinh
doi chieu » doc hieu, doi chi, ho chieu
canh tinh » hanh tinh, manh tinh, canh tranh
tong cong » trong cong, cong cong, dung cong
cong tac » cong ty
tac phan » tac pham, tai phan, tac phat
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 - ((canh trinh) or (canh tinh)) va tong cong tac phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - ((canh trinh) OR (canh tinh)) va tong cong tac phan tu.
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - ((canh trinh) or (canh tinh)) va tong cong tac phan tu*.