Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
canh trinh » canh tranh, hanh trinh, canh tinh
cong thanh » dong thanh, cong trinh, cong tan
trinh qua » trinh quan, trinh cua, trinh quang
song cong » cong cong, tong cong, song hong
toan cao » toan tap
toan ban » van ban
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 trinh qua song cong thanh ((toan cao) OR (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((ha tinh) OR (chieu sach)) - canh trinh qua song cong thanh ((toan cao) OR (toan ban)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((ha tinh) or (chieu sach)) - canh trinh qua song cong thanh ((toan cao) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: ho ((ha tinh) or (chieu sach)) - canh trinh qua song cong thanh ((toan cao) OR (toan ban))*.