Perhaps you should try some spelling variations:
"modified optimal convolution algorithmss" » "modified optimal evolution algorithm", "modified optimal evolution algorithms", "modified optimal solution algorithms", "modified optimal solution algorithmss", "modified thermal convolution algorithmss"
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"

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