Perhaps you should try some spelling variations:
"so dan thanh ky thuat ban hoc" » "so dang thanh ky thuat ban hoc", "so danh thanh ky thuat ban hoc", "so ban thanh ky thuat ban hoc", "so dan thanh ky thuat bai hoc", "so dan thanh ky thuat bao hoc", "so dan thanh ky thuat san hoc", "so dan hanh ky thuat ban hoc", "so dan than ky thuat ban hoc", "so dan thanh tay thuat ban hoc", "so dan thanh ky thuat bang hoc", "so dan thanh ky thuat van hoc", "co dan thanh ky thuat ban hoc", "so dac thanh ky thuat ban 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 than 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 dan thanh 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 dan thanh ky thuat ban hoc") OR ("so sach nhan ky thuat toan hoc")).
• Removing quotes may allow a broader search: (( so dan thanh ky thuat ban hoc ) or ( so sach nhan ky thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so dan thanh ky thuat ban hoc") or ("so sach nhan ky thuat toan hoc"))*.