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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("dong optimizer algorithms") or ((("_ estimation algorithms") OR ("_ optimization algorithms"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dong optimizer algorithms") OR ((("_ estimation algorithms") OR ("_ optimization algorithms")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"dong optimizer algorithms\") or (((\"_ estimation algorithms\") OR (\"_ optimization algorithms\"))))".
• Removing quotes may allow a broader search: (( dong optimizer algorithms ) or ((( _ estimation algorithms ) OR ( _ optimization algorithms )))).
• Adding a wildcard symbol may retrieve word variants: (("dong optimizer algorithms") or ((("_ estimation algorithms") OR ("_ optimization algorithms"))))*.