Perhaps you should try some spelling variations:
"modified parameter optimization algorithms" » "modified parameter optimisation algorithm", "modified parameter estimation algorithm", "modified parameter optimized algorithms", "modified parameters optimization algorithms"
"modified allocation estimation algorithms" » "modified allocation optimization algorithms", "modified motion estimation algorithms", "modified allocation estimation algorithm", "modified allocation optimisation algorithm", "modified allocation approximation algorithms"

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