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

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