Perhaps you should try some spelling variations:
"modified multiobjective estimation algorithm" » "modified multiobjective optimization 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 estimation algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified optimal optimized algorithms") OR ("modified multiobjective estimation algorithm"))*.
• Removing quotes may allow a broader search: (( modified optimal optimized algorithms ) or ( modified multiobjective estimation algorithm ))*.