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