Perhaps you should try some spelling variations:
"ham-based processor architectures" » "pham-based processor architectures", "tham-based processor architectures", "nham-based processor architectures", "ham-based professor architectures", "ham-based process architectures", "ham-based processes architectures"
"ptham-based processor architecture" » "ptpham-based processor architecture", "pttham-based processor architecture", "ptnham-based processor architecture", "ptham-based professor architecture", "ptham-based process architecture", "ptham-based processes architecture", "pham-based processor architecture", "tham-based processor architecture"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("ham-based processor architectures") or ("ptham-based processor architecture"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("ham-based processor architectures") OR ("ptham-based processor architecture")).
• Removing quotes may allow a broader search: (( ham-based processor architectures ) or ( ptham-based processor architecture )).
• Adding a wildcard symbol may retrieve word variants: (("ham-based processor architectures") or ("ptham-based processor architecture"))*.