Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
tang nguon » tang nguyen, dung nguon, tao nguon
hien xanh » hien hanh, hien nhanh, hien khanh
tranh cua » doanh cua, manh cua
bang ngon » danh ngon, dang ngoc, canh ngon
van toan » van tuan, van tan, van thanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu xanh)) - canh tranh cua ((tang nguon) OR (bang ngon)) van toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu xanh)) - canh tranh cua ((tang nguon) OR (bang ngon)) van toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (chieu xanh)) - canh tranh cua ((tang nguon) OR (bang ngon)) van toan tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu xanh)) - canh tranh cua ((tang nguon) OR (bang ngon)) van toan tap*.