Perhaps you should try some spelling variations:
"so danh hanh ky thuat ban hoc" » "so danh thanh ky thuat ban hoc", "so dang hanh ky thuat ban hoc", "so dan hanh ky thuat ban hoc", "so danh hanh ky thuat bai hoc", "so danh hanh ky thuat bao hoc", "so danh hanh ky thuat san hoc", "do danh hanh ky thuat ban hoc", "so sanh hanh ky thuat ban hoc", "so danh hanh kem thuat ban hoc", "so danh hanh ky thuat bang hoc", "so danh hanh 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 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 danh hanh ky thuat ban hoc") OR ("so sach nhan ky thuat toan hoc"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"so danh hanh ky thuat ban hoc\") OR (\"so sach nhan ky thuat toan hoc\"))".
• Removing quotes may allow a broader search: (( so danh hanh ky thuat ban hoc ) OR ( so sach nhan ky thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so danh hanh ky thuat ban hoc") OR ("so sach nhan ky thuat toan hoc"))*.