Perhaps you should try some spelling variations:
"su sach nganh xay thuat toan khoa" » "su sach ngan xay thuat toan khoa", "su sach tranh xay thuat toan khoa", "su cac nganh xay thuat toan khoa", "su sach nganh mac thuat toan khoa", "su sach nganh y thuat toan khoa", "su sach nganh ma thuat toan khoa", "su sach nganh my thuat toan khoa", "su sach nganh va thuat toan khoa", "su sach nganh cac thuat toan khoa", "so sach nganh xay thuat toan khoa", "vu sach nganh xay thuat toan khoa"
"bo sach nganh ky thuat toan hoc" » "bo sach ngan ky thuat toan hoc", "bo sach tranh ky thuat toan hoc", "bo cac nganh ky thuat toan hoc", "bo sach nganh y thuat toan hoc", "bo sach hanh ky thuat toan hoc", "bo sach nganh co thuat toan hoc", "bo sach nganh ky thuat van hoc", "bo sach nganh ky thuat hoa hoc", "bo sach nganh ky thuat tin hoc", "co sach nganh ky thuat toan hoc", "hoc sach nganh ky thuat toan hoc"

Try widening your search to All Fields.

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

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