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