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

Try widening your search to All Fields.

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