Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong trinh, truong thanh
thanh hoa » thanh pho
cong tan » cong tac, cong san, cong ty
toan cao » toan ban, toan tap
hoa va » hoa van, hoa xa, hoa vo
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((trieu tinh) or (chieu sach)) - thanh hoa va nhung ((cong thanh) OR (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((trieu tinh) OR (chieu sach)) - thanh hoa va nhung ((cong thanh) OR (cong tan)) toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((trieu tinh) or (chieu sach)) - thanh hoa va nhung ((cong thanh) OR (cong tan)) toan cao*".