Perhaps you should try some spelling variations:
"_ optimization algorithms" » "_ optimisation algorithm", "_ estimation algorithm", "_ optimized algorithms"
"_ estimation algorithms" » "_ estimation algorithm", "_ optimisation algorithm", "_ approximation algorithms"
"don optimizer algorithms" » "don optimized algorithms", "don optimized algorithm", "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 ((("_ optimization algorithms") OR ("_ estimation algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("don optimizer algorithms") OR ((("_ optimization algorithms") OR ("_ estimation algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"don optimizer algorithms\") or (((\"_ optimization algorithms\") OR (\"_ estimation algorithms\"))))".
• Removing quotes may allow a broader search: (( don optimizer algorithms ) or ((( _ optimization algorithms ) OR ( _ estimation algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("don optimizer algorithms") or ((("_ optimization algorithms") OR ("_ estimation algorithms"))))*.