Perhaps you should try some spelling variations:
"so sach ngan ky thuat toan hoc" » "so sach ngon ky thuat toan hoc", "so sach nha ky thuat toan hoc", "so sach han ky thuat toan hoc", "so sach ngan ky thuat toan khoa", "so sach ngan ky thuat van hoc", "so sach ngan ky thuat hoa hoc", "so sanh ngan ky thuat toan hoc", "bo sach ngan ky thuat toan hoc", "co sach ngan ky thuat toan hoc", "so sach nganh ky thuat toan hoc", "so sach nhan ky thuat toan hoc", "so sach ngan hay thuat toan hoc"
"so sach danh ky thuat toan hoc" » "so sach tranh ky thuat toan hoc", "so sach dao ky thuat toan hoc", "so sach dung ky thuat toan hoc", "so sach danh ky thuat toan khoa", "so sach danh ky thuat van hoc", "so sach danh ky thuat hoa hoc", "so sanh danh ky thuat toan hoc", "bo sach danh ky thuat toan hoc", "co sach danh ky thuat toan hoc", "so sach hanh ky thuat toan hoc", "so sach dan ky thuat toan hoc", "so sach dang ky 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 danh ky thuat toan hoc") or ("so sach ngan ky thuat toan hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so sach danh ky thuat toan hoc") OR ("so sach ngan ky thuat toan hoc")).
• Removing quotes may allow a broader search: (( so sach danh ky thuat toan hoc ) or ( so sach ngan ky thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so sach danh ky thuat toan hoc") or ("so sach ngan ky thuat toan hoc"))*.