Perhaps you should try some spelling variations:
"so sach ngan y thuat toan hoc" » "so sach ngon y thuat toan hoc", "so sach nha y thuat toan hoc", "so sach han y thuat toan hoc", "so sach ngan y thuat toan khoa", "so sach ngan y thuat van hoc", "so sach ngan y thuat hoa hoc", "so sanh ngan y thuat toan hoc", "bo sach ngan y thuat toan hoc", "co sach ngan y thuat toan hoc", "so sach ngan my thuat toan hoc", "so sach ngan kxy thuat toan hoc", "so sach ngan ki thuat toan hoc", "so sach nganh y thuat toan hoc", "so sach nhan y thuat toan hoc", "so sach nganh ky thuat toan hoc"
"so sach manh ky thuat toan hoc" » "so sach danh ky thuat toan hoc", "so sach tranh ky thuat toan hoc", "so cach mang ky thuat toan hoc", "so sach manh ky thuat toan khoa", "so sach manh ky thuat van hoc", "so sach manh ky thuat hoa hoc", "so sanh manh ky thuat toan hoc", "bo sach manh ky thuat toan hoc", "co sach manh ky thuat toan hoc", "so sach manh kmy thuat toan hoc", "so sach manh kkxy thuat toan hoc", "so sach manh kki thuat toan hoc", "so sach hanh ky thuat toan hoc", "so sach minh ky thuat toan hoc", "so sach manh duy thuat toan hoc"

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: (("so sach ngan y thuat toan hoc") OR ("so sach manh ky thuat toan hoc"))~.
• Removing quotes may allow a broader search: (( so sach ngan y thuat toan hoc ) or ( so sach manh ky thuat toan hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (("so sach ngan y thuat toan hoc") or ("so sach manh ky thuat toan hoc"))*.