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

Try widening your search to All Fields.

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