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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ optimized algorithms") OR ("_ optimization algorithms"))) or ("game estimation algorithms"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("_ optimized algorithms") OR ("_ optimization algorithms"))) OR ("game estimation algorithms")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"_ optimized algorithms\") OR (\"_ optimization algorithms\"))) or (\"game estimation algorithms\"))".
• Removing quotes may allow a broader search: (((( _ optimized algorithms ) OR ( _ optimization algorithms ))) or ( game estimation algorithms )).
• Adding a wildcard symbol may retrieve word variants: (((("_ optimized algorithms") OR ("_ optimization algorithms"))) or ("game estimation algorithms"))*.