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

Try widening your search to All Fields.

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