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