Perhaps you should try some spelling variations:
"so danh thanh ki thuat van hoc" » "so dinh thanh ki thuat van hoc", "so dang thanh ki thuat van hoc", "so nhanh thanh ki thuat van hoc", "so danh thanh ki thuat san hoc", "so danh thanh ki thuat va hoc", "so danh thanh ki thuat ban hoc", "so danh thanh kim thuat van hoc", "so danh thanh ky thuat van hoc", "so danh thanh ke thuat van hoc", "do danh thanh ki thuat van hoc", "so sanh thanh ki thuat van hoc", "so dan thanh ki thuat van hoc", "so danh thanh ki thuat van hoa"
"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 hoa hoc", "so sach nhan ky thuat tin 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 thanh ki thuat van hoc") or ("so sach nhan ky thuat toan hoc"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so danh thanh ki thuat van hoc") OR ("so sach nhan ky thuat toan hoc")).
• Removing quotes may allow a broader search: (( so danh thanh ki thuat van hoc ) or ( so sach nhan ky thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (("so danh thanh ki thuat van hoc") or ("so sach nhan ky thuat toan hoc"))*.