Perhaps you should try some spelling variations:
"modified static optimization algorithm" » "modified static optimization algorithms", "modified static estimation algorithm", "modified static estimation algorithms", "modified stage optimization algorithm", "modified stochastic optimization algorithm", "modified staffing optimization algorithm"
"modified aging optimisation algorithm" » "modified aging optimization algorithms", "modified aging estimation algorithm", "modified aging estimation algorithms", "modified staffing optimization algorithm", "modified caging optimisation algorithm"

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