Perhaps you should try some spelling variations:
"so sach ngon ky thuat toan khoa" » "so sach ngan ky thuat toan khoa", "so danh ngon ky thuat toan khoa", "so canh ngon ky thuat toan khoa", "so sanh ngon ky thuat toan khoa", "bo sach ngon ky thuat toan khoa", "co sach ngon ky thuat toan khoa", "so sach ngon keo thuat toan khoa"
"so sach hanh va thuat toan hoc" » "so sach danh va thuat toan hoc", "so sach han va thuat toan hoc", "so sac hanh va thuat toan hoc", "so sach hanh ki thuat toan hoc", "so sach hanh va thuc toan hoc", "so sach hanh va thiet toan hoc", "so sach hanh va thuat van hoc", "so sach hanh va thuat hoa hoc", "so sach hanh va thuat tin hoc", "so sanh hanh va thuat toan hoc", "bo sach hanh va thuat toan hoc", "co sach hanh va thuat toan hoc", "so sach hang va thuat toan hoc", "so sach hanh vi thuat toan hoc"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("so sach ngon ky thuat toan khoa") or ("so sach hanh va thuat toan hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so sach ngon ky thuat toan khoa") OR ("so sach hanh va thuat toan hoc")).
• Removing quotes may allow a broader search: (( so sach ngon ky thuat toan khoa ) or ( so sach hanh va thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so sach ngon ky thuat toan khoa") or ("so sach hanh va thuat toan hoc"))*.