Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
cong toan » cong tan, cong tuan, cong doan
cong hoan » cong hoa, dong hoa, cong san
tranh va » tranh van, trang va, trinh va
phan cac » nhan cach, phan dau, phan lap
va bang » va nang, va lang, va ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) OR (chieu sach)) - canh tranh va bang ((cong toan) or (cong hoan)) phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (chieu sach)) - canh tranh va bang ((cong toan) OR (cong hoan)) phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (chieu sach)) - canh tranh va bang ((cong toan) or (cong hoan)) phan cac".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (chieu sach)) - canh tranh va bang ((cong toan) or (cong hoan)) phan cac*.