Perhaps you should try some spelling variations:
"modified multiobjective optimized algorithm" » "modified multiobjective optimization algorithm", "modified multiobjective optimized algorithms", "modified multiobjective optimizer algorithms"
"modified cliffs predation algorithm" » "modified cliffs predators algorithm", "modified cliffs estimation algorithm", "modified cliff prediction algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified cliffs predation algorithm\") OR (\"modified multiobjective optimized algorithm\"))~".
• Removing quotes may allow a broader search: (( modified cliffs predation algorithm ) OR ( modified multiobjective optimized algorithm ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified cliffs predation algorithm") OR ("modified multiobjective optimized algorithm"))*.