Perhaps you should try some spelling variations:
"modified multiobjective optimisation algorithmssss" » "modified multiobjective optimization algorithmssss", "modified objective optimization algorithmssss", "modified multiobjective optimisation algorithm"
"modified _ optimization algorithms" » "modified _ optimisation algorithm", "modified _ estimation algorithms", "modified _ estimation algorithm"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified _ optimization algorithms") OR ("modified multiobjective optimisation algorithmssss"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified _ optimization algorithms\") OR (\"modified multiobjective optimisation algorithmssss\"))".
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