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