Perhaps you should try some spelling variations:
"_ estimation algorithms" » "_ estimation algorithm", "_ optimization algorithms", "_ optimisation algorithm"
"done optimized algorithms" » "done optimized algorithm", "done optimization algorithms", "dong optimized algorithms", "one optimized algorithms", "don optimized algorithms"
"_ optimizer algorithms" » "_ optimized algorithm", "_ optimization algorithms", "_ optimized algorithms", "_ optimize algorithms", "_ optimise algorithms"

Try widening your search to All Fields.

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