Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ estimation algorithms", "_ optimization 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 ((("_ optimisation algorithm") or ("_ optimized algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("done optimized algorithm") OR ((("_ optimisation algorithm") OR ("_ optimized algorithms")))).
• Removing quotes may allow a broader search: (( done optimized algorithm ) or ((( _ optimisation algorithm ) or ( _ optimized algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("done optimized algorithm") or ((("_ optimisation algorithm") or ("_ optimized algorithms"))))*.