Perhaps you should try some spelling variations:
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimised algorithm"
"_ optimize algorithms" » "_ optimized algorithms", "_ optimizer algorithms", "_ optimization algorithms", "_ optimise algorithms"
"parameter estimates algorithm" » "parameter estimation algorithm", "parameter estimation algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ optimized algorithm") or ("_ optimize algorithms"))) or ("parameter estimates algorithm"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimized algorithm") OR ("_ optimize algorithms"))) OR ("parameter estimates algorithm")).
• Removing quotes may allow a broader search: (((( _ optimized algorithm ) or ( _ optimize algorithms ))) or ( parameter estimates algorithm )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimized algorithm") or ("_ optimize algorithms"))) or ("parameter estimates algorithm"))*.