Perhaps you should try some spelling variations:
"so danh nganh ky thuat toan khoa" » "so dang nganh ky thuat toan khoa", "so danh nhan ky thuat toan khoa", "so danh ngon ky thuat toan khoa", "so danh nganh y thuat toan khoa", "so danh nganh xay thuat toan khoa", "so danh nganh co thuat toan khoa", "do danh nganh ky thuat toan khoa", "so dan nganh ky thuat toan khoa", "so danh nganh ky thuat tran khoa"
"so sanh hanh ky thuat toan khoa" » "so xanh hanh ky thuat toan khoa", "so danh thanh ky thuat toan khoa", "so ban hanh ky thuat toan khoa", "do sanh hanh ky thuat toan khoa", "so sanh hanh kem thuat toan khoa", "so sanh hanh ky thuat tran khoa"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("so sanh hanh ky thuat toan khoa") or ("so danh nganh ky thuat toan khoa"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("so sanh hanh ky thuat toan khoa") OR ("so danh nganh ky thuat toan khoa")).
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• Adding a wildcard symbol may retrieve word variants: (("so sanh hanh ky thuat toan khoa") or ("so danh nganh ky thuat toan khoa"))*.