Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
thong than » thong thanh, thong phan, thong nhan
tranh cua » doanh cua, manh cua
cua thong » cua thuong, cua khong, cua tong
thong tan » thong tran, thong tin, thong van
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - canh tranh cua thong ((thong tan) OR (thong than)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sach)) - canh tranh cua thong ((thong tan) OR (thong than)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sach)) - canh tranh cua thong ((thong tan) OR (thong than)) toan cau*.