Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithm", "_ optimized algorithms"
"same estimation algorithms" » "same estimation algorithm", "same optimisation algorithm", "same approximation algorithms", "pose estimation algorithms", "sphere estimation algorithms"
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms"

Try widening your search to All Fields.

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