Perhaps you should try some spelling variations:
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"
"modified based predation algorithm" » "modified based predators algorithm", "modified based estimation algorithm", "modified based prediction algorithm", "modified based gradation algorithm", "modified male predation algorithm"

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