Perhaps you should try some spelling variations:
thanh hoang » thanh cong, thanh hoa, thanh toan
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
toan thanh » tran thanh, hoan thanh, toan thang
cong doan » cong dan, dong doanh, cong san
cong hoan » cong hoa, dong hoa, cong san

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

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