Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"_ optimized algorithms" » "_ optimizer algorithms", "_ optimization algorithms", "_ optimizer algorithmss"
"done optimized algorithm" » "done optimizer algorithms", "dong optimized algorithm", "one optimized algorithm", "don optimized algorithm"

Try widening your search to All Fields.

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