Perhaps you should try some spelling variations:
"modified multiobjective optimization algorithm" » "modified multiobjective optimization algorithms", "modified multiobjective optimisation algorithm", "modified multiobjective estimation algorithm"
"modified effect estimation algorithms" » "modified effect estimation algorithm", "modified effect optimization algorithms", "modified effect optimisation algorithm", "modified effect investigation algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified effect estimation algorithms") or ("modified multiobjective optimization algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified effect estimation algorithms") OR ("modified multiobjective optimization algorithm")).
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