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

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