Perhaps you should try some spelling variations:
approximation algorithm » approximation algorithms
convolution algorithm » convolution algorithms, evolution algorithm, solution algorithm
near approximation » one approximation, network approximation, _ approximation
modified near » modified seird, modified adam

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• Performing a fuzzy search may retrieve terms with similar spellings: (( modified near approximation algorithm ) or ( machine learning convolution algorithm ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( modified near approximation algorithm ) OR ( machine learning convolution algorithm )).
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