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

You may be able to get more results by adjusting your search query.

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