Perhaps you should try some spelling variations:
"so danh than ky thuat ban hoc" » "so danh thanh ky thuat ban hoc", "so danh thang ky thuat ban hoc", "so danh nhan ky thuat ban hoc", "so danh than ky thuat bai hoc", "so danh than ky thuat bao hoc", "so danh than ky thuat san hoc", "do danh than ky thuat ban hoc", "so sanh than ky thuat ban hoc", "so dan than ky thuat ban hoc", "so danh than ky thuat bang hoc", "so danh than ky thuat van hoc"
"so sach nhan ky thuat toan hoc" » "so sach nha ky thuat toan hoc", "so sach han ky thuat toan hoc", "so sach ngan ky thuat toan hoc", "so sach nhan ky thuat toan khoa", "so sach nhan ky thuat van hoc", "so sach nhan ky thuat hoa hoc", "so sanh nhan ky thuat toan hoc", "bo sach nhan ky thuat toan hoc", "co sach nhan ky thuat toan hoc", "so sach nhan y thuat toan hoc", "so sach nhat ky thuat toan hoc", "so sach nhan my 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 danh than ky thuat ban hoc") or ("so sach nhan ky thuat toan hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so danh than ky thuat ban hoc") OR ("so sach nhan ky thuat toan hoc")).
• Removing quotes may allow a broader search: (( so danh than ky thuat ban hoc ) or ( so sach nhan ky thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so danh than ky thuat ban hoc") or ("so sach nhan ky thuat toan hoc"))*.