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

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