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

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