Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tinh » thanh binh, nhanh tinh, than kinh
hanh tinh » hanh trinh, nhanh tinh, canh tinh
ho chieu » theo chieu, hoc thieu, doi chieu
cua bang » chua bang, cua ban, cua dang
cong tan » cong tac, cong san, cong thanh
hoa dau » hoa dan, hoa dai, hoa dam

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 - ((hanh tinh) OR (thanh tinh)) cua bang ((cong trinh) or (cong tan)) hoa dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - ((hanh tinh) OR (thanh tinh)) cua bang ((cong trinh) OR (cong tan)) hoa dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - ((hanh tinh) OR (thanh tinh)) cua bang ((cong trinh) or (cong tan)) hoa dau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - ((hanh tinh) OR (thanh tinh)) cua bang ((cong trinh) or (cong tan)) hoa dau*.