Perhaps you should try some spelling variations:
"_ estimation algorithmss" » "_ estimation algorithms", "_ estimation algorithm", "_ optimization algorithms"
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"game optimizer algorithms" » "game optimized algorithms", "game optimized algorithm", "game optimization algorithms", "same optimizer algorithms"

Try widening your search to All Fields.

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