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

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