Perhaps you should try some spelling variations:
"_ estimating algorithm" » "_ estimation algorithm", "_ estimation algorithms", "_ splitting algorithm"
"_ solution algorithm" » "_ evolution algorithm", "_ convolution algorithms", "_ evolutionary algorithm", "_ solutions algorithm"
"time approximation algorithms" » "one approximation algorithms", "_ approximation algorithms"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("_ estimating algorithm") or ("_ solution algorithm"))) or ("time approximation algorithms"))~.
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