Perhaps you should try some spelling variations:
"_ optimization algorithm" » "_ optimization algorithms", "_ optimisation algorithm", "_ estimation algorithm"
"cover estimation algorithms" » "cover estimation algorithm", "cover optimization algorithms", "cover optimisation algorithm", "cover estimations algorithms", "pose estimation algorithms", "sphere estimation algorithms"
"_ optimized algorithm" » "_ optimized algorithms", "_ optimizer algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("cover estimation algorithms") or ((("_ optimization algorithm") or ("_ optimized algorithm"))))~.
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• Adding a wildcard symbol may retrieve word variants: (("cover estimation algorithms") or ((("_ optimization algorithm") or ("_ optimized algorithm"))))*.