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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified stochastic optimization algorithm\") OR (\"modified changing optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified stochastic optimization algorithm ) OR ( modified changing optimization algorithms ))~.
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