Perhaps you should try some spelling variations:
"_ optimisation algorithm" » "_ optimization algorithms", "_ estimation algorithm", "_ estimation algorithms", "_ optimization algorithm"
"_ optimizer algorithmss" » "_ optimizer algorithms", "_ optimized algorithms", "_ optimized algorithmss", "_ optimize algorithmss", "_ optimise algorithmss"
"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 ((("_ optimisation algorithm") or ("_ optimizer algorithmss"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("dong optimized algorithm") OR ((("_ optimisation algorithm") OR ("_ optimizer algorithmss")))).
• Removing quotes may allow a broader search: (( dong optimized algorithm ) or ((( _ optimisation algorithm ) or ( _ optimizer algorithmss )))).
• Adding a wildcard symbol may retrieve word variants: (("dong optimized algorithm") or ((("_ optimisation algorithm") or ("_ optimizer algorithmss"))))*.