Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, hieu cach
chieu xanh » chieu sang, chieu tinh, hieu manh
thong cong » trong cong, tong cong, thong thong
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 ((((chieu sach) OR (chieu xanh))) or (chiet tach)) - canh tranh cua thong cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((((chieu sach) OR (chieu xanh))) OR (chiet tach)) - canh tranh cua thong cong bai toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((((chieu sach) OR (chieu xanh))) or (chiet tach)) - canh tranh cua thong cong bai toan cau*".