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

Try widening your search to All Fields.

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