Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
khong cong » thong cong, khong cang, chong cong
va khong » va thong, va phong, va thuong
tan toan » tan tran, tap toan, dan toan
van toan » van tuan, van tan, van thanh
sinh va » sinh vat, tinh va, dinh van

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu sang)) - nhan sinh va khong cong ((tan toan) OR (van toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sang)) - nhan sinh va khong cong ((tan toan) or (van toan)) cau*.