Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
khong cong » thong cong, khong cang, chong cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
cua khong » hua khong, cua phuong, cua thuong
tinh cua » trinh cua, sinh cua, tinh chat
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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)) - hanh tinh cua khong cong tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((trieu tinh) OR (chieu sach)) - hanh tinh cua khong cong tap toan cau*.