Perhaps you should try some spelling variations:
"modified parameter optimization algorithms" » "modified parameter optimisation algorithm", "modified parameter estimation algorithms", "modified parameter estimation algorithm", "modified parameter optimisation algorithms", "modified parameter estimation algorithmss", "modified parameters optimization algorithms"
"modified game optimization algorithm" » "modified game optimisation algorithm", "modified game estimation algorithm", "modified game estimation algorithms", "modified stage optimization algorithm", "modified qoe optimization algorithm", "modified market optimization algorithm", "modified male optimization algorithm", "modified adam optimization algorithm"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified game optimization algorithm\") OR (\"modified parameter optimization algorithms\"))~".
• Removing quotes may allow a broader search: (( modified game optimization algorithm ) OR ( modified parameter optimization algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified game optimization algorithm") OR ("modified parameter optimization algorithms"))*.