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

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