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

Try widening your search to All Fields.

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