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