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 multiobjective source algorithm" » "modified multiobjective lot algorithm", "modified multiobjective our algorithm", "modified multiobjective search algorithm"

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