Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms"
"one approximation algorithms" » "time approximation algorithms", "_ approximation algorithms", "rough approximations algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("one approximation algorithms") or ((("_ optimization algorithm") or ("_ optimized algorithm"))))~.
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