Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh thanh » canh tranh, danh thanh, anh thanh
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
thanh qua » thanh quan, thanh qui, hanh qua
toan cao » toan ban, toan tap
ha tinh » va tinh, may tinh

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

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