Perhaps you should try some spelling variations:
"modified objective optimization algorithm" » "modified multiobjective optimization algorithm", "modified objective optimization algorithms", "modified objective optimisation algorithm", "modified objective estimation algorithm"
"modified sphere optimizer algorithms" » "modified sphere optimized algorithms", "modified sphere optimized algorithm", "modified sphere optimization algorithms"

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