Perhaps you should try some spelling variations:
"modified sphere optimization algorithms" » "modified sphere optimisation algorithm", "modified sphere estimation algorithms", "modified sphere estimation algorithm", "modified stage optimization algorithms", "modified response optimization algorithms"
"modified objective convolution algorithms" » "modified objective evolution algorithm", "modified objective solution algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified sphere optimization algorithms\") OR (\"modified objective convolution algorithms\"))~".
• Removing quotes may allow a broader search: (( modified sphere optimization algorithms ) OR ( modified objective convolution algorithms ))~.
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