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

Try widening your search to All Fields.

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