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

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