Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithms" » "modified multiobjective optimization algorithms", "modified multiobjective estimation algorithm", "modified multiobjective optimisation algorithm"
"modified robust optimized algorithms" » "modified robust optimized algorithm", "modified robust optimizer algorithms", "modified robust optimization algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective estimation algorithms") OR ("modified robust optimized algorithms"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified multiobjective estimation algorithms\") OR (\"modified robust optimized algorithms\"))*".
• Removing quotes may allow a broader search: (( modified multiobjective estimation algorithms ) OR ( modified robust optimized algorithms ))*.