Perhaps you should try some spelling variations:
"so dinh hanh kem thuyet bai hoc" » "so dinh hanh kem thuyet va hoc", "so dinh thanh kem thuyet bai hoc", "so dinh khanh kem thuyet bai hoc", "so dinh hoang kem thuyet bai hoc", "do dinh hanh kem thuyet bai hoc", "co dinh hanh kem thuyet bai hoc", "so sinh hanh kem thuyet bai hoc", "so dinh hanh kem thuyet dai hoc", "so dinh hanh kiem thuyet bai hoc"
"so sach nha ky thuat toan khoa" » "so sanh nha ky thuat toan khoa", "bo sach nha ky thuat toan khoa", "co sach nha ky thuat toan khoa", "so sach nhat ky thuat toan khoa", "so sach nhan ky thuat toan khoa", "so sach nha ly thuat toan khoa", "so sach nha ky thuat tran khoa"

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

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