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

Try widening your search to All Fields.

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