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

Try widening your search to All Fields.

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