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