Perhaps you should try some spelling variations:
"so sach ngonh ky thuat toan hoc" » "so sach ngon ky thuat toan hoc", "so sach nganh ky thuat toan hoc", "so sach ngonh ky thuat toan khoa", "so sach ngonh ky thuat van hoc", "so sach ngonh ky thuat hoa hoc", "so sanh ngonh ky thuat toan hoc", "bo sach ngonh ky thuat toan hoc", "co sach ngonh ky thuat toan hoc"
"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"

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