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

Try widening your search to All Fields.

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