Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified based gradation algorithm" » "modified based predation algorithm", "modified based estimation algorithm", "modified based evaluation algorithm", "modified based prediction algorithm", "modified male gradation algorithm"

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