Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization algorithm"
"modified bi1 optimization algorithms" » "modified bi1 optimisation algorithm", "modified bi1 estimation algorithms", "modified bi1 optimized algorithms", "modified _ optimization algorithms", "modified qoe optimization algorithms", "modified game optimization algorithms"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified bi1 optimization algorithms\") OR (\"modified multiobjective estimation algorithm\"))~".
• Removing quotes may allow a broader search: (( modified bi1 optimization algorithms ) OR ( modified multiobjective estimation algorithm ))~.
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