Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
dong doanh » dung doanh, trong doanh, doanh doanh
cong doan » cong dan, cong hoan, cong san
tranh va » tranh van, trang va, trinh va
phan cac » nhan cach, phan dau, phan lap

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