Perhaps you should try some spelling variations:
"modified multiobjective optimizer algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective optimized algorithms", "modified multiobjective optimized algorithm"
"modified learning predators algorithm" » "modified learning predation algorithm", "modified marine predators algorithm", "mobile learning predators algorithm", "modified caging predators algorithm"

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