Perhaps you should try some spelling variations:
"modified time convolution algorithms" » "modified time evolution algorithm", "modified time solution algorithm", "modified time evolution algorithms", "modified bi1 convolution algorithms", "modified male convolution algorithms"
"modified notion approximation algorithms" » "modified network approximation algorithms", "modified time approximation algorithms", "modified one approximation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified notion approximation algorithms") or ("modified time convolution algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified notion approximation algorithms") OR ("modified time convolution algorithms"))*.
• Removing quotes may allow a broader search: (( modified notion approximation algorithms ) or ( modified time convolution algorithms ))*.