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

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified multiobjective optimization algorithms") or ("modified write optimizer algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified multiobjective optimization algorithms") OR ("modified write optimizer algorithms"))*.
• Removing quotes may allow a broader search: (( modified multiobjective optimization algorithms ) or ( modified write optimizer algorithms ))*.