Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"defined network optimization algorithm" » "defined network optimization algorithms", "defined network optimisation algorithm", "defined network estimation algorithms", "designed network optimization algorithm"

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