Perhaps you should try some spelling variations:
"modified parameter optimization algorithmss" » "modified parameter optimization algorithms", "modified parameter optimisation algorithm", "modified parameter estimation algorithms", "modified parameters optimization algorithmss"
"modified objective optimal algorithm" » "modified objective optimized algorithm", "modified objective optimized algorithms", "modified objective optimizer algorithms"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("modified objective optimal algorithm") OR ("modified parameter optimization algorithmss"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"modified objective optimal algorithm\") OR (\"modified parameter optimization algorithmss\"))*".
• Removing quotes may allow a broader search: (( modified objective optimal algorithm ) OR ( modified parameter optimization algorithmss ))*.